Add Python tool scaffold for PokeDB data import

Set up tools/import-pokedb/ with CLI, JSON loader, and output models.
Replaces the Go/PokeAPI approach with local PokeDB.org JSON processing.

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

.beans/nuzlocke-tracker-gkcy--output-seed-json.md

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+---
+# nuzlocke-tracker-gkcy
+title: Output seed JSON
+status: todo
+type: task
+priority: normal
+created_at: 2026-02-11T08:43:21Z
+updated_at: 2026-02-11T08:43:33Z
+parent: nuzlocke-tracker-bs05
+blocking:
+    - nuzlocke-tracker-vdks
+---
+
+Generate the final per-game JSON files in the existing seed format.
+
+## Checklist
+
+- [ ] **Apply route ordering**: Use the existing `backend/src/app/seeds/route_order.json` to assign `order` values to routes. Handle aliases (e.g. "red-blue" → "firered-leafgreen"). Log warnings for routes not in the order file.
+- [ ] **Merge special encounters**: Integrate starters, gifts, fossils, and trades from `backend/src/app/seeds/special_encounters.json` into the appropriate routes.
+- [ ] **Output per-game JSON**: Write `{game-slug}.json` files matching the existing format:
+  ```json
+  [{"name": "Route 1", "order": 3, "encounters": [...], "children": []}]
+  ```
+- [ ] **Output games.json**: Generate the global games list from `version_groups.json` (this may already be handled by existing config, verify).
+- [ ] **Output pokemon.json**: Generate the global pokemon list including all pokemon referenced in any encounter. Include pokeapi_id, national_dex, name, types, sprite_url.
+- [ ] **Handle version exclusives**: Ensure encounters specific to one version in a version group only appear in that game's JSON file (e.g. FireRed exclusives vs LeafGreen exclusives).
+
+## Notes
+- The output must be a drop-in replacement for the existing files in `backend/src/app/seeds/data/`
+- Boss data (`{game}-bosses.json`) is NOT generated by this tool — it's manually curated
+- Evolutions data is also separate (currently from PokeAPI) — out of scope for this task