[INIT-001] Initial project setup with Clean Architecture (feat)

- Implemented Clean Architecture with Domain, Application, Infrastructure, Presentation layers
- Added comprehensive project structure following SOLID principles
- Created Kubernetes deployment with Helm charts (HPA, PDB, NetworkPolicy)
- Configured ArgoCD for automated deployment (production + staging)
- Implemented CI/CD pipeline with GitHub Actions
- Added comprehensive documentation (handbook, architecture, coding standards)
- Configured PostgreSQL, Redis, Celery for backend services
- Created modern landing page with Persian fonts (Vazirmatn)
- Added Docker multi-stage build for production
- Configured development tools (pytest, black, flake8, mypy, isort)
- Added pre-commit hooks for code quality
- Implemented Makefile for common operations

argocd/README.md

@@ -0,0 +1,154 @@
+# ArgoCD Deployment
+
+This directory contains ArgoCD Application manifests for deploying Peikarband to Kubernetes.
+
+## Files
+
+- `application.yaml`: Production deployment (main branch → peikarband namespace)
+- `application-staging.yaml`: Staging deployment (develop branch → peikarband-staging namespace)
+
+## Prerequisites
+
+1. ArgoCD installed in your cluster
+2. Git repository access configured in ArgoCD
+3. Docker registry credentials (if using private registry)
+
+## Deployment
+
+### 1. Add Git Repository to ArgoCD
+
+```bash
+# For SSH
+argocd repo add git@git.peikarband.ir:ehsan-minadd/peikarband.git \
+  --ssh-private-key-path ~/.ssh/id_rsa \
+  --insecure-skip-server-verification
+
+# Or using argocd UI: Settings → Repositories → Connect Repo
+```
+
+### 2. Deploy Production
+
+```bash
+kubectl apply -f argocd/application.yaml
+```
+
+### 3. Deploy Staging
+
+```bash
+kubectl apply -f argocd/application-staging.yaml
+```
+
+## Sync Policy
+
+Both applications use **automatic sync** with:
+- **Auto-prune**: Remove resources deleted from Git
+- **Self-heal**: Automatically sync when cluster state differs from Git
+- **Retry logic**: 5 attempts with exponential backoff
+
+## Monitoring
+
+```bash
+# Check application status
+argocd app get peikarband
+argocd app get peikarband-staging
+
+# Watch sync progress
+argocd app sync peikarband --watch
+
+# View logs
+argocd app logs peikarband
+```
+
+## Manual Sync
+
+```bash
+# Force sync
+argocd app sync peikarband --force
+
+# Sync with prune
+argocd app sync peikarband --prune
+```
+
+## Rollback
+
+```bash
+# List history
+argocd app history peikarband
+
+# Rollback to specific revision
+argocd app rollback peikarband <REVISION>
+```
+
+## Architecture
+
+```
+┌─────────────────────────────────────────────────┐
+│                    ArgoCD                        │
+│  ┌───────────────────┐  ┌──────────────────┐   │
+│  │  Production App   │  │   Staging App    │   │
+│  │  (main branch)    │  │ (develop branch) │   │
+│  └─────────┬─────────┘  └────────┬─────────┘   │
+└────────────┼─────────────────────┼──────────────┘
+             │                     │
+             ▼                     ▼
+    ┌────────────────┐    ┌─────────────────┐
+    │   namespace:   │    │    namespace:   │
+    │   peikarband   │    │ peikarband-stg  │
+    └────────────────┘    └─────────────────┘
+```
+
+## Environment Variables
+
+Override via Helm values:
+
+```yaml
+# In values-production.yaml or values-staging.yaml
+env:
+  - name: DATABASE_URL
+    value: "postgresql://..."
+  - name: REDIS_URL
+    value: "redis://..."
+```
+
+## Secrets Management
+
+Secrets should be managed outside Git:
+
+```bash
+# Using kubectl
+kubectl create secret generic peikarband-secrets \
+  --from-literal=database-password=xxx \
+  --namespace=peikarband
+
+# Or using Sealed Secrets, External Secrets Operator, etc.
+```
+
+## Troubleshooting
+
+### Application Out of Sync
+
+```bash
+argocd app sync peikarband --force
+```
+
+### Image Pull Errors
+
+Check registry credentials:
+```bash
+kubectl get secret regcred -n peikarband -o yaml
+```
+
+### Health Check Failing
+
+View pod logs:
+```bash
+kubectl logs -n peikarband -l app=peikarband --tail=100
+```
+
+### Helm Values Override Not Working
+
+Verify values file path in Application manifest:
+```bash
+argocd app manifests peikarband | grep valueFiles
+```
+