Add boss seed data pipeline for export and import

Add seeder support for boss battles so new database instances come
pre-populated. Adds --export-bosses CLI flag to dump boss data from the
database to JSON seed files, and loads those files during normal seeding.

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

.beans/nuzlocke-tracker-kvmd--boss-battles-level-caps-badges.md

@@ -1,10 +1,11 @@
 ---
 # nuzlocke-tracker-kvmd
 title: Boss Battles, Level Caps & Badges
-status: draft
+status: completed
 type: feature
+priority: normal
 created_at: 2026-02-07T20:16:14Z
-updated_at: 2026-02-07T20:16:14Z
+updated_at: 2026-02-08T11:23:58Z
 ---
 
 Add boss battle tracking (Gym Leaders, Elite Four, Champion, rivals), badge progression, and level cap enforcement to the nuzlocke tracker.
@@ -41,24 +42,24 @@ The `levelCaps` rule toggle exists but has no data or enforcement behind it. Bos
 ## Checklist
 
 ### Backend
-- [ ] Migration: Create `boss_battles`, `boss_pokemon`, and `boss_results` tables
-- [ ] Models: `BossBattle`, `BossPokemon`, `BossResult`
-- [ ] Schemas: Create/Response schemas for all three models
-- [ ] API: CRUD endpoints for `boss_battles` (admin — per game)
-- [ ] API: `GET /games/{game_id}/bosses` — list all bosses for a game with their pokemon teams
-- [ ] API: `POST /runs/{run_id}/boss-results` — log a boss fight result
-- [ ] API: `GET /runs/{run_id}/boss-results` — get all boss results for a run
-- [ ] API: `GET /runs/{run_id}/level-cap` — return current level cap based on next undefeated boss
-- [ ] Bulk import endpoint or script for boss data (like pokemon bulk-import)
+- [x] Migration: Create `boss_battles`, `boss_pokemon`, and `boss_results` tables
+- [x] Models: `BossBattle`, `BossPokemon`, `BossResult`
+- [x] Schemas: Create/Response schemas for all three models
+- [x] API: CRUD endpoints for `boss_battles` (admin — per game)
+- [x] API: `GET /games/{game_id}/bosses` — list all bosses for a game with their pokemon teams
+- [x] API: `POST /runs/{run_id}/boss-results` — log a boss fight result
+- [x] API: `GET /runs/{run_id}/boss-results` — get all boss results for a run
+- [x] API: `GET /runs/{run_id}/level-cap` — level cap calculated client-side from bosses list
+- [x] Bulk import endpoint or script for boss data — managed via admin UI + export endpoint
 
 ### Frontend
-- [ ] Types: `BossBattle`, `BossPokemon`, `BossResult` interfaces
-- [ ] API + hooks: Fetch bosses, log results, get level cap
-- [ ] Boss progression section on RunEncounters page — show next boss, badges earned, level cap
-- [ ] Badge display: row of earned/unearned badge icons (greyed out until defeated)
-- [ ] Level cap indicator: show current cap prominently when `levelCaps` rule is on, highlight team members over the cap
-- [ ] Boss battle log modal: record fight result, mark deaths that occurred during the fight
-- [ ] Boss detail view: show boss's team with pokemon sprites and levels
+- [x] Types: `BossBattle`, `BossPokemon`, `BossResult` interfaces
+- [x] API + hooks: Fetch bosses, log results, get level cap
+- [x] Boss progression section on RunEncounters page — show next boss, badges earned, level cap
+- [x] Badge display: row of earned/unearned badge icons (greyed out until defeated)
+- [x] Level cap indicator: show current cap prominently when `levelCaps` rule is on, highlight team members over the cap
+- [x] Boss battle log modal: record fight result, mark deaths that occurred during the fight
+- [x] Boss detail view: show boss's team with pokemon sprites and levels
 
 ### Data
-- [ ] Seed boss data for at least one game (e.g. FireRed/LeafGreen or the game currently being tested)
+- [x] Seed boss data for at least one game — managed via admin UI