feat: implement MC domain filter proxy, API, dashboard

- proxy: asyncio TCP proxy with handshake parser, domain whitelist,
  transparent backend tunneling, SQLite logging, mtime hot reload
- api: FastAPI routes for config/domains/logs/status + restart trigger
- frontend: React + Vite NPM-style dashboard (dashboard/domains/logs/settings)
- nginx: reverse proxy for /api -> api:8000 and / -> frontend:3000
- docker-compose: full stack with shared data volume
- replace spec mc-domain-filter.md with README.md

api/routes/logs.py

@@ -0,0 +1,38 @@
+"""접속 로그 조회."""
+from __future__ import annotations
+
+import sqlite3
+
+from fastapi import APIRouter, Query
+
+from config_io import LOG_DB
+
+router = APIRouter()
+
+
+@router.get("/logs")
+def list_logs(
+    limit: int = Query(50, ge=1, le=500),
+    offset: int = Query(0, ge=0),
+    action: str | None = Query(None),
+) -> dict:
+    if not LOG_DB.exists():
+        return {"total": 0, "items": []}
+    con = sqlite3.connect(LOG_DB)
+    try:
+        con.row_factory = sqlite3.Row
+        where, params = "", []
+        if action:
+            where = "WHERE action = ?"
+            params.append(action)
+        total = con.execute(
+            f"SELECT COUNT(*) FROM connections {where}", params
+        ).fetchone()[0]
+        rows = con.execute(
+            f"SELECT id, ts, client_ip, domain, next_state, action, reason "
+            f"FROM connections {where} ORDER BY id DESC LIMIT ? OFFSET ?",
+            [*params, limit, offset],
+        ).fetchall()
+    finally:
+        con.close()
+    return {"total": total, "items": [dict(r) for r in rows]}