fix: remove hardcoded src prefix from package imports

The handler discovery and dependency resolver were using hardcoded
'src.application', 'src.domain', 'src.infrastructure' paths which
don't exist when the package is installed via pip.

When installed, the package structure is:
- application/ (not src.application)
- domain/
- infrastructure/

This caused handler discovery to fail with 'No matches found for
pattern: src' when running the CLI from an installed package.

Changes:
- HandlerDiscoveryService: Changed default base_package from
  'src.application' to 'application' (line 96)
- HandlerDiscoveryService: Fixed fallback discovery path (line 339)
- DependencyResolver: Removed 'src.' prefix from fallback import
  locations (lines 356-358)

Fixes CLI import errors when package is installed via pip install.

Author: fgogolli

src/infrastructure/di/components/dependency_resolver.py

@@ -353,9 +353,9 @@ def _resolve_string_annotation(self, annotation: str, context_class: type) -> ty
                 # Last resort: try to import from common locations
                 for module_name in [
                     "typing",
-                    "src.domain",
-                    "src.application",
-                    "src.infrastructure",
+                    "domain",
+                    "application",
+                    "infrastructure",
                 ]:
                     try:
                         module_obj = __import__(module_name, fromlist=[annotation])

src/infrastructure/di/handler_discovery.py

@@ -93,7 +93,7 @@ def _resolve_cache_path_fallback(self) -> str:
         os.makedirs(cache_dir, exist_ok=True)
         return os.path.join(cache_dir, "handler_discovery.json")
 
-    def discover_and_register_handlers(self, base_package: str = "src.application") -> None:
+    def discover_and_register_handlers(self, base_package: str = "application") -> None:
         """
         Discover all handlers and register them with the DI container.
         Uses caching to improve performance on subsequent runs.
@@ -336,7 +336,7 @@ def _register_handlers_from_cache(self, cached_handlers: dict[str, Any]) -> None
     def _fallback_to_full_discovery(self) -> None:
         """Fall back to full discovery if cache loading fails."""
         logger.info("Falling back to full handler discovery")
-        self._discover_handlers("src.application")
+        self._discover_handlers("application")
         self._register_handlers()
 
     def _get_source_file_mtimes(self, base_package: str) -> dict[str, float]: