feat: convert ssh tunnels into a plugin

src/backend/database/db/index.ts

@@ -394,18 +394,6 @@ async function initializeCompleteDatabase(): Promise<void> {
         FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
     );
 
-    CREATE TABLE IF NOT EXISTS c2s_tunnel_presets (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        user_id TEXT NOT NULL,
-        name TEXT NOT NULL,
-        config TEXT NOT NULL,
-        platform TEXT,
-        computer_name TEXT,
-        created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-        updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-        FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
-    );
-
     CREATE TABLE IF NOT EXISTS ssh_folders (
         id INTEGER PRIMARY KEY AUTOINCREMENT,
         user_id TEXT NOT NULL,