refactor: remove test.db, use only posterg.db for all environments

- Simplified Database.php determineDatabasePath to always use posterg.db
- Removed test.db auto-detection based on php_sapi_name
- Removed test.db targets from justfile (migrate-test removed)
- Removed CreateTestDatabase.php fixture script
- Updated migrate.sh to only init posterg.db
- Updated setup-dev.sh to init posterg.db
- Updated run-tests.php (removed DB_ENV=test env var)
- Updated deploy-db to use posterg.db
- Removed test.db file

refactor: remove empty fixtures directory

justfile

@@ -33,7 +33,6 @@ deploy:
         --chown="www-data:posterg" \
         --exclude 'vendor' \
         --exclude 'tests' \
-        --exclude 'test.db' \
         --exclude '*.md' \
         --exclude '.git*' \
         --exclude '.jj' \
@@ -80,9 +79,9 @@ deploy-nginx:
 
 [group('deploy')]
 deploy-db:
-    @ssh posterg '[ ! -f /var/www/posterg/storage/test.db ]' || (echo "ERROR: remote database already exists. Remove it manually if you intend to overwrite." && exit 1)
-    rsync -v --progress app/storage/test.db posterg:/var/www/posterg/storage/test.db
-    ssh posterg "chown www-data:posterg /var/www/posterg/storage/test.db && chmod 660 /var/www/posterg/storage/test.db"
+    @ssh posterg '[ ! -f /var/www/posterg/storage/posterg.db ]' || (echo "ERROR: remote database already exists. Remove it manually if you intend to overwrite." && exit 1)
+    rsync -v --progress app/storage/posterg.db posterg:/var/www/posterg/storage/posterg.db
+    ssh posterg "chown www-data:posterg /var/www/posterg/storage/posterg.db && chmod 660 /var/www/posterg/storage/posterg.db"
 
 # ============================================================================
 # Testing
@@ -90,20 +89,20 @@ deploy-db:
 
 [group('test')]
 test:
-    @DB_ENV=test php app/tests/run-tests.php
+    @php app/tests/run-tests.php
 
 [group('test')]
 test-unit:
-    @DB_ENV=test php app/tests/Unit/DatabaseTest.php
-    @DB_ENV=test php app/tests/Unit/RateLimitTest.php
+    @php app/tests/Unit/DatabaseTest.php
+    @php app/tests/Unit/RateLimitTest.php
 
 [group('test')]
 test-integration:
-    @DB_ENV=test php app/tests/Integration/SearchTest.php
+    @php app/tests/Integration/SearchTest.php
 
 [group('test')]
 test-security:
-    @DB_ENV=test php app/tests/Security/SecurityTest.php
+    @php app/tests/Security/SecurityTest.php
 
 [group('test')]
 syntax:
@@ -117,41 +116,29 @@ syntax:
 [group('database')]
 migrate:
     @echo "Running migrations…"
-    @bash scripts/migrate.sh both
-
-[group('database')]
-migrate-test:
-    @bash scripts/migrate.sh test
-
-[group('database')]
-migrate-prod:
-    @bash scripts/migrate.sh prod
+    @bash scripts/migrate.sh
 
 [group('database')]
 init-db:
-    @sqlite3 app/storage/test.db < app/storage/schema.sql
-    @sqlite3 app/storage/test.db "SELECT COUNT(*) || ' tables' FROM sqlite_master WHERE type='table';"
+    @sqlite3 app/storage/posterg.db < app/storage/schema.sql
+    @sqlite3 app/storage/posterg.db "SELECT COUNT(*) || ' tables' FROM sqlite_master WHERE type='table';"
 
 [group('database')]
 reset-db:
-    @rm -f app/storage/test.db
+    @rm -f app/storage/posterg.db
     @just init-db
 
 [group('database')]
 query:
-    @sqlite3 app/storage/test.db
+    @sqlite3 app/storage/posterg.db
 
 [group('database')]
 show id:
-    @sqlite3 -column -header app/storage/test.db "SELECT * FROM v_theses_full WHERE id = {{id}};";
+    @sqlite3 -column -header app/storage/posterg.db "SELECT * FROM v_theses_full WHERE id = {{id}};";
 
 [group('database')]
 backup:
-    @sqlite3 app/storage/test.db .dump > app/storage/backup_$(date +%Y%m%d_%H%M%S).sql
-
-[group('database')]
-fixtures:
-    @php app/storage/fixtures/CreateTestDatabase.php
+    @sqlite3 app/storage/posterg.db .dump > app/storage/backup_$(date +%Y%m%d_%H%M%S).sql
 
 # ============================================================================
 # Utils