Initial commit: Gitea MCP server with 62 tools

- Full Gitea REST API coverage for repos, issues, PRs, branches,
  files, releases, webhooks, orgs, notifications
- Multi-instance support via config.json
- pyproject.toml with pinned dependencies (mcp[cli], httpx)
- config.example.json as credentials template (config.json is gitignored)

config.example.json

@@ -0,0 +1,9 @@
+{
+  "instances": {
+    "default": {
+      "url": "https://your-gitea.example.com",
+      "token": "your_personal_access_token_here"
+    }
+  },
+  "default": "default"
+}