Add --export flag to export all seed data from DB to JSON

Replaces --export-bosses with a unified --export that dumps games,
pokemon, evolutions, routes/encounters, and bosses to seeds/data/.
Each export function mirrors the corresponding API export endpoint.

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

.beans/nuzlocke-tracker-009n--add-cli-export-for-all-seed-data-types.md

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+---
+# nuzlocke-tracker-009n
+title: Add CLI export for all seed data types
+status: completed
+type: feature
+priority: normal
+created_at: 2026-02-08T11:37:27Z
+updated_at: 2026-02-08T11:38:48Z
+---
+
+Add export functions for games, pokemon, routes/encounters, and evolutions to the seed CLI, matching the existing export API endpoints. Consolidate with the existing --export-bosses into a single --export flag that dumps everything.
+
+## Checklist
+- [x] Add export_games() to run.py — writes games.json
+- [x] Add export_pokemon() to run.py — writes pokemon.json
+- [x] Add export_routes() to run.py — writes {game_slug}.json per game (routes + encounters)
+- [x] Add export_evolutions() to run.py — writes evolutions.json
+- [x] Replace --export-bosses with --export flag that exports all data types
+- [x] Update __main__.py docstring