Add initial infrastructure and backup scripts for Gitea and homelab deployment

- Create README.md with project layout and quick start instructions
- Implement backup scripts for Gitea, including database and repository exports
- Add systemd service and timer for automated Gitea backups
- Develop bootstrap scripts for homelab and VPS setup
- Document architecture and restore procedures
- Configure Caddy reverse proxy and Docker Compose for service management
- Establish secrets management guidelines

stacks/gitea/compose.yml

@@ -0,0 +1,29 @@
+services:
+  gitea:
+    image: gitea/gitea:1.23.8
+    restart: unless-stopped
+    environment:
+      - USER_UID=1000
+      - USER_GID=1000
+      - GITEA__database__DB_TYPE=postgres
+      - GITEA__database__HOST=gitea-db:5432
+      - GITEA__database__NAME=${POSTGRES_DB}
+      - GITEA__database__USER=${POSTGRES_USER}
+      - GITEA__database__PASSWD=${POSTGRES_PASSWORD}
+    ports:
+      - "4445:3000"
+      - "2222:2222"
+    volumes:
+      - /srv/data/gitea:/data
+    depends_on:
+      - gitea-db
+
+  gitea-db:
+    image: postgres:14.15
+    restart: unless-stopped
+    environment:
+      - POSTGRES_DB=${POSTGRES_DB}
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+    volumes:
+      - /srv/data/gitea-postgres:/var/lib/postgresql/data