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/chat.rs

@@ -0,0 +1,31 @@
+use sqlx::PgPool;
+use uuid::Uuid;
+use anyhow::Result;
+
+// TODO: Define ChatMessage struct (id, server_id, steam_id, player_name, message, channel, flagged, timestamp)
+// TODO: Define PlayerAction struct (id, server_id, steam_id, action_type, reason, performed_by, created_at)
+
+/// Store an incoming chat message from the game server.
+pub async fn insert_chat_message(pool: &PgPool, server_id: Uuid, steam_id: &str, player_name: &str, message: &str, channel: &str) -> Result<Uuid> {
+    todo!()
+}
+
+/// Retrieve chat messages for a server with pagination.
+pub async fn get_chat_messages(pool: &PgPool, server_id: Uuid, limit: i64, offset: i64) -> Result<()> {
+    todo!()
+}
+
+/// Flag a chat message for review (toxic, spam, etc.).
+pub async fn flag_message(pool: &PgPool, message_id: Uuid, flagged: bool) -> Result<()> {
+    todo!()
+}
+
+/// Get moderation actions taken against a player.
+pub async fn get_player_actions(pool: &PgPool, server_id: Uuid, steam_id: &str) -> Result<()> {
+    todo!()
+}
+
+/// Record a moderation action (kick, ban, mute, warn).
+pub async fn create_player_action(pool: &PgPool, server_id: Uuid, steam_id: &str, action_type: &str, reason: &str, performed_by: Uuid) -> Result<Uuid> {
+    todo!()
+}