feat: add marketplace dependency and update project config

- Add gitea-mcp-server git dependency from marketplace
- Update version to 0.2.0
- Update entry point to server_http:main
- Add MCP and Caddy environment variables to .env.example
- Update uvicorn and starlette versions
- Add pyjwt for authentication
- Regenerate requirements.txt with all dependencies

Closes #22

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -1,3 +1,7 @@
+# --- Gitea MCP Server env vars (used by marketplace package) ---
+GITEA_API_URL=https://gitea.hotserv.cloud/api/v1
+GITEA_API_TOKEN=your_gitea_personal_access_token
+
 # Gitea Configuration
 GITEA_URL=https://gitea.example.com
 GITEA_TOKEN=your_gitea_api_token_here
@@ -8,6 +12,9 @@ GITEA_REPO=your_repo_name
 HTTP_HOST=127.0.0.1
 HTTP_PORT=8000
 
+# --- Caddy / TLS ---
+MCP_DOMAIN=mcp-gitea.hotserv.cloud
+
 # Authentication Configuration (Optional)
 # AUTH_TOKEN=your_bearer_token_here