Add self-contained Gitea Git service with PostgreSQL integration

- Implements complete Gitea Git service following rick-infra self-contained architecture
- Uses PostgreSQL infrastructure role as dependency and manages own database/user
- Native Arch Linux installation via pacman packages
- Automatic database setup (gitea database and user creation)
- SystemD service with security hardening and proper dependency management
- Caddy reverse proxy integration deployed to sites-enabled directory
- SSH server on port 2222 with automatic host key generation
- Production-ready with LFS support, security headers, and HTTPS via Caddy
- Follows simplified configuration approach with essential variables only
- Self-contained pattern: service manages complete setup independently

roles/gitea/meta/main.yml

@@ -0,0 +1,29 @@
+---
+galaxy_info:
+  author: Rick's Infrastructure Team
+  description: Self-contained Gitea Git service for rick-infra
+  company: Personal Infrastructure
+  
+  license: MIT
+  
+  min_ansible_version: "2.9"
+  
+  platforms:
+    - name: ArchLinux
+      versions:
+        - all
+  
+  galaxy_tags:
+    - git
+    - gitea
+    - development
+    - archlinux
+
+dependencies:
+  - role: postgresql
+    tags: ['postgresql', 'infrastructure']
+  - role: caddy
+    tags: ['caddy']
+
+# Self-contained Gitea service
+# Manages its own database using PostgreSQL infrastructure