docs: add CI/CD components comparison and alternatives analysis

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+# CI/CD Компоненты: Сравнение, Альтернативы и Обоснование выбора
+
+**Версия:** 1.0  
+**Дата:** Январь 2026  
+**Целевая аудитория:** Technical Architects, DevOps Team, Management  
+**Статус:** Decision Document
+
+---
+
+## Executive Summary
+
+### Рекомендованный Stack для FinTech
+
+| Компонент | Продукт | License | Annual Cost | Обоснование |
+|-----------|---------|---------|-------------|-------------|
+| **Git Repository** | Gitea | MIT | $0 | Lightweight, full-featured, zero cost |
+| **CI Server** | Jenkins | MIT | $0 | Industry standard, 1800+ plugins |
+| **GitOps** | ArgoCD/Custom | Apache 2.0 | $0 | Best GitOps, audit trail |
+| **Container Registry** | Harbor | Apache 2.0 | $0 | Security scanning built-in |
+| **Orchestration UI** | Portainer CE | Zlib | $0 | User-friendly, RBAC |
+| **TOTAL** | | | **$0** | **vs $6,720 commercial stack** |
+
+---
+
+## Содержание
+
+1. [Git Repository: Gitea vs Alternatives](#git-repository-gitea)
+2. [CI Server: Jenkins vs Alternatives](#ci-server-jenkins)
+3. [GitOps: ArgoCD vs Alternatives](#gitops-argocd)
+4. [Container Registry: Harbor vs Alternatives](#container-registry-harbor)
+5. [Orchestration UI: Portainer vs Alternatives](#orchestration-ui-portainer)
+6. [Cost Comparison](#cost-comparison)
+
+---
+
+## Git Repository: Gitea
+
+### Функциональность
+
+**Core Features:**
+- Git repository hosting (unlimited repos)
+- Pull Request workflow + code review
+- Issues + Projects (Kanban)
+- Wiki documentation
+- Branch protection rules
+- Webhooks для CI integration
+- LDAP/AD authentication
+- GPG commit signing
+- Git LFS support
+
+**Performance:**
+- RAM usage: 200-500 MB
+- Single Go binary (50-100 MB)
+- Fast startup (<5 seconds)
+- SQLite/PostgreSQL/MySQL support
+
+### Альтернативы
+
+| Feature | Gitea | GitLab CE | GitHub Enterprise | Bitbucket |
+|---------|-------|-----------|-------------------|-----------|
+| **Cost** | FREE | FREE | $21/user/mo | $30/user/mo |
+| **RAM** | 200 MB | 4+ GB | 2+ GB | 1-2 GB |
+| **Setup** | 5 min | 30-60 min | 60+ min | 30 min |
+| **Built-in CI** | ❌ | ✅ | ✅ | ✅ |
+| **Lightweight** | ✅ | ❌ | ❌ | ⚠️ |
+
+### Почему Gitea?
+
+✅ **Zero cost** - критично для budget  
+✅ **Lightweight** - 200 MB RAM vs 4+ GB GitLab  
+✅ **Simple** - single binary, easy upgrade  
+✅ **Full-featured** - все нужное для Git workflow  
+✅ **LDAP ready** - corporate authentication  
+
+**Use GitLab instead if:**
+- Need integrated CI/CD (without Jenkins)
+- Team already knows GitLab
+- Can allocate 8+ GB RAM
+
+---
+
+## CI Server: Jenkins
+
+### Функциональность
+
+**Core Features:**
+- Pipeline as Code (Jenkinsfile)
+- 1800+ plugins ecosystem
+- Distributed builds (master-agent)
+- Docker/Kubernetes integration
+- LDAP/AD + RBAC
+- Credentials management
+- Audit trail
+- Blue Ocean modern UI
+
+**Plugin Examples:**
+```
+Security:
+├─ OWASP Dependency Check
+├─ SonarQube Scanner
+├─ Trivy Container Scanner
+└─ Snyk Security
+
+Integrations:
+├─ Gitea Plugin
+├─ Docker Plugin
+├─ Kubernetes Plugin
+├─ Slack Notification
+└─ Email Extension
+
+Quality:
+├─ JUnit Test Results
+├─ Code Coverage (JaCoCo)
+├─ Warnings Next Generation
+└─ Performance Plugin
+```
+
+### Альтернативы
+
+| Feature | Jenkins | GitLab CI | GitHub Actions | Drone |
+|---------|---------|-----------|----------------|-------|
+| **Cost** | FREE | FREE | Cloud/Self-hosted | FREE |
+| **Plugins** | 1800+ | Limited | Marketplace | ~100 |
+| **Flexibility** | High | Medium | Medium | Medium |
+| **Learning Curve** | Medium | Low | Low | Low |
+| **Git Agnostic** | ✅ | ❌ GitLab only | ❌ GitHub only | ✅ |
+
+### Pipeline Example
+
+```groovy
+pipeline {
+    agent { docker { image 'maven:3.8-openjdk-17' } }
+    
+    stages {
+        stage('Build') {
+            steps {
+                sh 'mvn clean package'
+            }
+        }
+        
+        stage('Test') {
+            parallel {
+                stage('Unit Tests') {
+                    steps { sh 'mvn test' }
+                }
+                stage('Security Scan') {
+                    steps { sh 'mvn dependency-check:check' }
+                }
+            }
+        }
+        
+        stage('Docker Build') {
+            steps {
+                sh 'docker build -t app:${BUILD_NUMBER} .'
+            }
+        }
+        
+        stage('Push to Harbor') {
+            steps {
+                sh 'docker push harbor.local/app:${BUILD_NUMBER}'
+            }
+        }
+    }
+}
+```
+
+### Почему Jenkins?
+
+✅ **Industry standard** - 70% Fortune 500 use it  
+✅ **Plugin ecosystem** - 1800+ plugins  
+✅ **Proven in FinTech** - JPMorgan, Deutsche Bank  
+✅ **Flexibility** - Pipeline as Code  
+✅ **Git agnostic** - works with Gitea, GitLab, etc.  
+
+**Use GitLab CI instead if:**
+- Using GitLab as Git provider
+- Need simpler YAML syntax
+- Want all-in-one platform
+
+---
+
+## GitOps: ArgoCD / Custom
+
+### ArgoCD (для Kubernetes)
+
+**Features:**
+- Declarative GitOps
+- Automatic sync from Git
+- Web UI (topology view)
+- Multi-cluster support
+- SSO (OIDC, LDAP)
+- Rollback capabilities
+- Audit logging
+
+**Альтернативы:**
+- **Flux CD** - no UI, CLI-first
+- **Jenkins X** - very opinionated
+- **Spinnaker** - complex, multi-cloud
+
+### Custom GitOps Operator (для Docker Swarm)
+
+**Why custom для Swarm:**
+- ArgoCD designed для K8s
+- Swarm simpler - custom operator = 200 lines Python
+- Full control, easy maintenance
+
+**Implementation:**
+
+```python
+# gitops-swarm-operator.py
+import time, subprocess
+from git import Repo
+
+class GitOpsOperator:
+    def __init__(self, repo_url, local_path):
+        self.repo = Repo.clone_from(repo_url, local_path)
+    
+    def sync_loop(self, interval=30):
+        while True:
+            self.repo.remotes.origin.pull()
+            
+            for compose_file in Path(self.local_path).rglob('docker-compose.yml'):
+                stack_name = compose_file.parent.name
+                subprocess.run([
+                    'docker', 'stack', 'deploy',
+                    '-c', str(compose_file),
+                    stack_name
+                ])
+            
+            time.sleep(interval)
+```
+
+### Почему ArgoCD/Custom?
+
+**Kubernetes:** ArgoCD  
+✅ Best-in-class UI  
+✅ Strong RBAC  
+✅ Audit trail  
+
+**Docker Swarm:** Custom  
+✅ Simple (200 lines)  
+✅ Lightweight (50 MB RAM)  
+✅ Easy troubleshooting  
+
+---
+
+## Container Registry: Harbor
+
+### Функциональность
+
+**Core Features:**
+- Docker Registry v2 API
+- Vulnerability scanning (Trivy)
+- Image signing (Notary/Cosign)
+- RBAC (project-level)
+- LDAP/AD integration
+- Replication
+- Webhook notifications
+- Audit logging
+
+**Security Workflow:**
+```
+Push Image → Harbor
+     │
+     ├──> Trivy Scan
+     │    ├─ OS vulnerabilities
+     │    └─ App dependencies
+     │
+     ├──> Policy Check
+     │    ├─ CRITICAL CVEs? → ❌ Block
+     │    ├─ HIGH CVEs? → ⚠️ Warn
+     │    └─ MEDIUM/LOW → ✅ Allow
+     │
+     └──> Notification
+          └─ Slack/Email
+```
+
+### Альтернативы
+
+| Feature | Harbor | Docker Registry | Nexus | Artifactory |
+|---------|--------|-----------------|-------|-------------|
+| **Cost** | FREE | FREE | FREE (limited) | $3K+/year |
+| **UI** | ✅ | ❌ | ✅ | ✅ |
+| **Vuln Scan** | ✅ Trivy | ❌ | ⚠️ Paid | ✅ |
+| **Signing** | ✅ | ❌ | ⚠️ Paid | ✅ |
+| **RBAC** | ✅ | ❌ | ✅ | ✅ |
+
+### Почему Harbor?
+
+✅ **Security built-in** - Trivy scanning included  
+✅ **Compliance-ready** - audit logs, signing  
+✅ **Enterprise RBAC** - project-level permissions  
+✅ **Zero cost** - vs $3K+ Artifactory  
+
+**Use Nexus instead if:**
+- Need multi-format (Maven, npm, PyPI)
+- Already using Sonatype tools
+
+---
+
+## Orchestration UI: Portainer
+
+### Функциональность
+
+**Core Features:**
+- Docker Swarm native support
+- Modern Web UI
+- Stack deployment (Compose)
+- RBAC + Teams
+- LDAP/AD integration
+- Container logs streaming
+- Resource monitoring
+- Template library
+
+**RBAC Example:**
+```
+Teams:
+├── DevOps (Admin)
+│   └─ Full access
+├── Developers
+│   └─ Deploy to dev only
+├── QA
+│   └─ Deploy to staging
+└── Managers
+    └─ View-only
+```
+
+### Альтернативы
+
+| Feature | Portainer CE | Swarmpit | Docker CLI | Rancher |
+|---------|--------------|----------|------------|---------|
+| **Cost** | FREE | FREE | FREE | FREE |
+| **UI** | ✅ Excellent | ✅ Good | ❌ | ✅ Excellent |
+| **RBAC** | ✅ | ⚠️ Basic | ❌ | ✅ |
+| **LDAP** | ✅ | ❌ | ❌ | ✅ |
+| **Swarm Focus** | ✅ | ✅ | ✅ | ⚠️ K8s focus |
+
+### Почему Portainer?
+
+✅ **User-friendly** - non-DevOps can deploy  
+✅ **RBAC** - compliance-ready access control  
+✅ **Free** - CE version has all needed features  
+✅ **Audit trail** - who deployed what  
+
+---
+
+## Cost Comparison
+
+### Recommended (Open Source)
+
+```
+Gitea:          $0
+Jenkins:        $0
+ArgoCD/Custom:  $0
+Harbor:         $0
+Portainer CE:   $0
+───────────────────
+TOTAL:          $0/year
+
+Savings:        $6,720/year
+```
+
+### Alternative (Commercial)
+
+```
+GitHub Enterprise:  $2,520/year (10 users)
+Bamboo CI:         $1,200/year
+Spinnaker:         $0 (FOSS)
+Artifactory:       $3,000/year
+Rancher:           $0 (FOSS)
+────────────────────────────────────
+TOTAL:             $6,720/year
+```
+
+---
+
+## Implementation Priority
+
+**Week 1-2: Core**
+1. Deploy Gitea + PostgreSQL
+2. Deploy Harbor
+3. Migrate existing repos
+
+**Week 3-4: CI/CD**
+4. Deploy Jenkins
+5. Create first pipeline
+6. Setup webhooks
+
+**Week 5-6: GitOps**
+7. Deploy ArgoCD/Custom
+8. Deploy Portainer
+9. End-to-end test
+
+---
+
+## Decision Matrix
+
+### When to Choose Alternatives
+
+**GitLab over Gitea:**
+- ❓ Need integrated CI/CD
+- ❓ Team knows GitLab
+- ❓ Have 8+ GB RAM
+
+**GitHub Actions over Jenkins:**
+- ❓ Using GitHub (not on-prem)
+- ❓ Simple workflows only
+
+**Artifactory over Harbor:**
+- ❓ Need multi-format registry
+- ❓ Budget allows $3K+/year
+
+**Rancher over Portainer:**
+- ❓ Multiple clusters
+- ❓ Heavy K8s focus
+
+---
+
+## Appendix: Quick Reference
+
+### Component URLs
+
+```
+Gitea:     https://git.company.local
+Jenkins:   https://jenkins.company.local
+Harbor:    https://harbor.company.local
+ArgoCD:    https://argocd.company.local
+Portainer: https://portainer.company.local:9443
+```
+
+### Default Ports
+
+```
+Gitea:     3000 (HTTP), 22 (SSH)
+Jenkins:   8080 (HTTP)
+Harbor:    80/443 (HTTP/HTTPS)
+ArgoCD:    8080 (HTTP), 8083 (gRPC)
+Portainer: 9443 (HTTPS), 8000 (Edge)
+```
+
+---
+
+**Document Version:** 1.0  
+**Last Updated:** Январь 2026  
+**Status:** Decision Document - Ready for Approval
+
+**Approvals:**
+- [ ] Technical Architect
+- [ ] DevOps Lead
+- [ ] Security Lead
+- [ ] CTO