feat: unify docs portal and MCP servers into one config-driven service

- add config.yml as single source of truth for collected repos/categories
- add collect.py CLI to pull lib/api/wiki site builds and mcp bundles from
  source repos and regenerate nginx.conf + _index/index.html
- port mcp runtime (main.py/core.py/config.py): nginx + health + FastMCP
  servers started from config.yml
- docker: python:3.13-slim + nginx, expose 8000-8006 + 9000 (html portal)
- drone: publish html (6007:9000) and MCP ports 8000-8006
- move mongo-ops docs to wiki/, add auth-server (api) and hexa (lib)
- refresh lib site builds (lib/ prefix) and collect mcp bundles

core.py

@@ -0,0 +1,63 @@
+import json
+from pathlib import Path
+from typing import Any
+
+from config import MCPBundle
+from mcp.server.fastmcp import FastMCP
+
+
+class MCPServer:
+    """MCP server serving a pre-built documentation bundle."""
+
+    def __init__(self, bundle: MCPBundle) -> None:
+        self.mcp_root = bundle.root
+        self.app = FastMCP(
+            name=f"{bundle.name}-mcp",
+            host="0.0.0.0",
+            port=bundle.port,
+        )
+        self._register_resources()
+        self._register_tools()
+
+    # ------------------------------------------------------------------
+    # Helpers
+    # ------------------------------------------------------------------
+
+    def _read_json(self, path: Path) -> Any:
+        if not path.exists():
+            return {"error": "not_found", "path": str(path)}
+        return json.loads(path.read_text(encoding="utf-8"))
+
+    # ------------------------------------------------------------------
+    # MCP resources
+    # ------------------------------------------------------------------
+
+    def _register_resources(self) -> None:
+        @self.app.resource("doc://index")
+        def index():
+            return self._read_json(self.mcp_root / "index.json")
+
+        @self.app.resource("doc://nav")
+        def nav():
+            return self._read_json(self.mcp_root / "nav.json")
+
+        @self.app.resource("doc://modules/{module}")
+        def module(module: str):
+            return self._read_json(self.mcp_root / "modules" / f"{module}.json")
+
+    # ------------------------------------------------------------------
+    # MCP tools
+    # ------------------------------------------------------------------
+
+    def _register_tools(self) -> None:
+        @self.app.tool()
+        def ping() -> str:
+            return "pong"
+
+    # ------------------------------------------------------------------
+    # ASGI exposure
+    # ------------------------------------------------------------------
+
+    @property
+    def asgi(self):
+        return self.app