feat: frps-manager v1.0 - frp 0.70.1 multi-tenant web management system

- Multi-tenant client/proxy management with Flask+SQLite
- Frps server control (start/restart/token rotation)
- Generate frpc.ini with shared server token + admin API
- Dashboard API integration (live client/proxy status)
- RBAC: admin/tenant_admin/user roles
- Audit logging for all operations
- Systemd service files included
- Requires legacy INI format (frp 0.70 TOML auth broken)

init_db.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+"""Initialize the frps-manager database."""
+import os
+import sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from app import app, db, seed_admin
+
+with app.app_context():
+    db.create_all()
+    seed_admin()
+    print("Database initialized successfully")