Add medium-complexity PHPUnit tests: Area recursion, controller validation ...

- AreaRecursionTest (10 tests): recursive traversal, depth limit ≤10,
  remove() cascade, inner devices/scripts lookup, parent_area()
- AreasRESTAPIControllerValidationTest (10 tests): new_area, update_alias,
  remove_area, place_in_area, update_display_name validation
- DevicesRESTAPIControllerValidationTest (12 tests): setup_new_device,
  do_device_action, update_alias, devices_list, place_in_area validation
- ScriptsRESTAPIControllerValidationTest (10 tests): run_action_script,
  set_*_state, place_in_area validation
- Fix Controller::validate_positive_int_ids() return type: ?array → ?string
- Add DevTools to TestApp/bootstrap for Model instantiation
- Expand bootstrap.php text_msgs with controller error aliases
- Update server-audit.md coverage table: 80 tests, 202 assertions

Add PHPUnit coverage: Entity CRUD, Area placing, Sessions, Utils ...

- EntityCrudTest: 6 tests covering update, get, remove, id, to_array
- AreaPlacingTest: 2 tests for place_in_area and place_in_area_id
- SessionsTest: 4 tests for create, get_by_token, close, status
- UtilsTest: 7 tests for response_error/success, table_row_is_exists,
  generate_token, dayname_translate, fast_ping_tcp
- TestApp helper + bootstrap init with SQLite :memory: for app() dependencies
- Update server-audit.md: 36 total tests, expand coverage roadmap

Add PHPUnit test suite: ThinBuilder, RateLimiter, PasswordHash (17 tests, all passing)