scaffold: Backend API routes, DB queries, and middleware stubs

88 handler stubs across 13 route files, 66 DB query stubs across
11 modules, auth/license extractors, and rate limit middleware.
All bodies are todo!() — ready for Phase 1b implementation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/db/servers.rs

@@ -0,0 +1,52 @@
+use sqlx::PgPool;
+use uuid::Uuid;
+use anyhow::Result;
+
+// TODO: Define ServerConnection struct (id, license_id, name, host, rcon_port, rcon_password_encrypted, query_port, created_at)
+// TODO: Define ServerConfig struct (id, server_id, seed, world_size, max_players, hostname, description, header_image_url, etc.)
+// TODO: Define GameAdmin struct (id, server_id, steam_id, role, added_at)
+
+/// Register a new server connection (RCON credentials).
+pub async fn create_server_connection(pool: &PgPool, license_id: Uuid, name: &str, host: &str, rcon_port: i32) -> Result<Uuid> {
+    todo!()
+}
+
+/// Fetch a server connection by ID.
+pub async fn get_server_connection(pool: &PgPool, server_id: Uuid) -> Result<()> {
+    todo!()
+}
+
+/// Update server connection details.
+pub async fn update_server_connection(pool: &PgPool, server_id: Uuid, name: Option<&str>, host: Option<&str>, rcon_port: Option<i32>) -> Result<()> {
+    todo!()
+}
+
+/// Create the initial server configuration record.
+pub async fn create_server_config(pool: &PgPool, server_id: Uuid) -> Result<Uuid> {
+    todo!()
+}
+
+/// Fetch server configuration.
+pub async fn get_server_config(pool: &PgPool, server_id: Uuid) -> Result<()> {
+    todo!()
+}
+
+/// Update server configuration fields.
+pub async fn update_server_config(pool: &PgPool, server_id: Uuid, seed: Option<i32>, world_size: Option<i32>, max_players: Option<i32>) -> Result<()> {
+    todo!()
+}
+
+/// Get all game admins (moderators/owners) for a server.
+pub async fn get_game_admins(pool: &PgPool, server_id: Uuid) -> Result<()> {
+    todo!()
+}
+
+/// Add a game admin by Steam ID.
+pub async fn create_game_admin(pool: &PgPool, server_id: Uuid, steam_id: &str, role: &str) -> Result<Uuid> {
+    todo!()
+}
+
+/// Remove a game admin.
+pub async fn delete_game_admin(pool: &PgPool, admin_id: Uuid) -> Result<()> {
+    todo!()
+}