Add utoipa and Scalar for API documentation

- Add utoipa and utoipa-scalar dependencies
- Add ToSchema derives to all models
- Add OpenAPI path annotations to auth, users, and health handlers
- Create openapi.rs module with API documentation
- Serve Scalar UI at /docs endpoint
- Include JWT bearer auth security scheme

Co-Authored-By: Warp <agent@warp.dev>

migrations/20260119000001_initial_schema.sql

@@ -41,6 +41,8 @@ CREATE TABLE IF NOT EXISTS team_players (
     date_created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
     team_id INTEGER NOT NULL REFERENCES teams(id) ON DELETE CASCADE,
     player_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    game_name TEXT NOT NULL DEFAULT '',
+    game_mode TEXT NOT NULL DEFAULT '',
     position VARCHAR(20) NOT NULL DEFAULT 'member',
     status INTEGER NOT NULL DEFAULT 0,
     UNIQUE(team_id, player_id)
@@ -70,6 +72,12 @@ CREATE TABLE IF NOT EXISTS ladder_teams (
     date_created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
     ladder_id INTEGER NOT NULL REFERENCES ladders(id) ON DELETE CASCADE,
     team_id INTEGER NOT NULL REFERENCES teams(id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    status VARCHAR(255) NOT NULL DEFAULT 'active',
+    seed INTEGER,
+    result_position INTEGER,
+    win_count INTEGER NOT NULL DEFAULT 0,
+    loss_count INTEGER NOT NULL DEFAULT 0,
     UNIQUE(ladder_id, team_id)
 );