feature/boss-sprites-and-badges (#22)

Reviewed-on: TheFurya/nuzlocke-tracker#22
Co-authored-by: Julian Tabel <juliantabel.jt@gmail.com>
Co-committed-by: Julian Tabel <juliantabel.jt@gmail.com>

.beans/nuzlocke-tracker-yfi8--fetch-boss-battle-sprites-from-bulbapedia.md

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+---
+# nuzlocke-tracker-yfi8
+title: Fetch boss battle sprites from Bulbapedia
+status: in-progress
+type: task
+priority: normal
+created_at: 2026-02-14T09:14:32Z
+updated_at: 2026-02-14T09:24:28Z
+---
+
+## Overview
+
+Write and run a one-time script to download boss battle trainer sprites from Bulbapedia's archives. For totem pokemon, link to existing pokemon sprites instead.
+
+## Current State
+- 10 game directories have sprites (122 files total): red, yellow, gold, crystal, ruby, emerald, firered, diamond, heartgold, omega-ruby
+- 11 game directories are completely missing: black, black-2, platinum, x, sun, ultra-sun, lets-go-pikachu, sword, brilliant-diamond, legends-arceus, scarlet
+- 11 boss entries have null sprite_url (firered Elite Four + heartgold Elite Four/Red)
+
+## Checklist
+- [x] Write download script with Bulbapedia image URL patterns
+- [x] Download sprites for all missing games
+- [x] Fill in null sprite_url entries for firered/heartgold
+- [x] Handle totem pokemon by linking to existing pokemon sprites
+- [x] Handle special cases (multi-boss entries, Legends Arceus nobles)
+- [x] Update seed JSON files with correct local paths

.beans/nuzlocke-tracker-zmvy--add-game-id-field-to-bossbattle-for-version-exclus.md

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+---
+# nuzlocke-tracker-zmvy
+title: Add game_id field to BossBattle for version-exclusive bosses
+status: completed
+type: feature
+priority: normal
+created_at: 2026-02-14T09:47:40Z
+updated_at: 2026-02-14T09:52:59Z
+---
+
+Add a proper game_id FK to BossBattle so version-exclusive bosses can be filtered per game instead of overloading the section field.