docs: add comprehensive README

README.md

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+# Prefect Deployment
+
+GitOps deployment for Prefect workflow orchestration with Tailscale HTTPS access.
+
+## Prerequisites
+
+### PostgreSQL Database
+
+Connect to your PostgreSQL server and create the database:
+
+```sql
+CREATE DATABASE prefect;
+CREATE USER prefect WITH PASSWORD 'your-secure-password';
+GRANT ALL PRIVILEGES ON DATABASE prefect TO prefect;
+
+-- PostgreSQL 15+ requires:
+\c prefect
+GRANT ALL ON SCHEMA public TO prefect;
+```
+
+### Host Configuration
+
+Download configuration files to `/opt/prefect` (first time only):
+
+```bash
+sudo mkdir -p /opt/prefect/tailscale
+sudo curl -o /opt/prefect/tailscale/serve-config.json https://gitea.arnodo.fr/Damien/prefect-deployment/raw/branch/main/serve-config.json
+```
+
+### Tailscale Auth Key
+
+Generate a reusable auth key from https://login.tailscale.com/admin/settings/keys
+
+## Deployment
+
+1. Create a new stack in Portainer
+2. Select "Repository" and point to this repository
+3. Portainer will load `stack.env` automatically
+4. Override sensitive values (`CHANGE_ME`) in the environment variables section:
+   - `TS_AUTHKEY` - Tailscale auth key (reusable recommended)
+   - `DB_PASSWORD` - PostgreSQL password
+5. Deploy
+
+## Access
+
+Once deployed: https://prefect.taila5ad8.ts.net
+
+## Architecture
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                     Tailscale Network                       │
+├─────────────────────────────────────────────────────────────┤
+│                                                             │
+│  ┌─────────────┐     ┌─────────────┐     ┌──────────────┐  │
+│  │  Tailscale  │────▶│   Prefect   │────▶│  PostgreSQL  │  │
+│  │   Sidecar   │     │   Server    │     │  (external)  │  │
+│  │   :443      │     │   :4200     │     │              │  │
+│  └─────────────┘     └──────┬──────┘     └──────────────┘  │
+│                             │                               │
+│                      ┌──────▼──────┐                       │
+│                      │    Redis    │                       │
+│                      │  (messaging)│                       │
+│                      └─────────────┘                       │
+│                                                             │
+│                      ┌─────────────┐                       │
+│                      │   Prefect   │                       │
+│                      │  Services   │                       │
+│                      │ (background)│                       │
+│                      └─────────────┘                       │
+│                                                             │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## Directory Structure
+
+```
+/opt/prefect/
+└── tailscale/
+    └── serve-config.json     # Tailscale HTTPS configuration
+```
+
+## Post-Deployment: Create Work Pool
+
+After the server is running, create a work pool for your workflows:
+
+```bash
+export PREFECT_API_URL=https://prefect.taila5ad8.ts.net/api
+prefect work-pool create backup-pool --type process
+```
+
+## Next Steps
+
+See the [flows/](flows/) directory for workflow examples (Phase 2).