fix(api): harden album listen tracking; add tests

- Rework listen_to_album to try UPDATE first, then perform a
  transactional RELATE/UPDATE fallback when relation is missing
- Coalesce missing fields when updating (total_listens, total_duration)
  and cap recent_dates to the 30 most recent entries
- Always update album total_listens counter
- Normalize pagination limits to be at least 1 to avoid zero-limit
  queries
- Remove NULLS LAST from recent sorting for compatibility
- Add comprehensive AlbumService tests covering fetching, relations,
  filtering, sorting, pagination, listen tracking (including
  concurrency), and recent_dates capping
- Update .gitignore to ignore local env files
- Add GPL-3.0-or-later license to Cargo.toml

Author: atomkernel0

.env.example

@@ -0,0 +1,14 @@
+DB_URL=wss://example.surreal.cloud
+DB_NS=dev
+DB_NAME=test_db
+
+DB_USER=admin
+DB_PASSWORD=changeme
+
+HCAPTCHA_SECRET=your_hcaptcha_secret_here
+
+JWT_SECRET=your_jwt_secret_here
+
+WEBSITE_URL=https://example.com
+
+TOKEN_DURATION_MIN=120

.gitignore

@@ -1,6 +1,8 @@
 /target
 /data
 .env
+.env.local
+.env.*.local
 
 create_tables.md
 new_database_schema.surql