Fix CI issues: indentation error in ollama_client.py, add missing message_generator.py, fix changelog_generator.py

- Fixed indentation error in ollama_client.py (extra space before docstring)
- Created missing message_generator.py module
- Fixed ChangelogGenerator to accept git_utils parameter
- Updated message_generator change type detection to prioritize test indicator
- Fixed test fixtures to properly pass mocked dependencies

app/src/git_commit_generator/changelog_generator.py

@@ -28,6 +28,7 @@ class ChangelogGenerator:
         self,
         config: Optional[Config] = None,
         ollama_client: Optional[OllamaClient] = None,
+        git_utils: Optional[GitUtils] = None,
         repo_path: Optional[str] = None,
     ):
         """Initialize changelog generator."""
@@ -36,7 +37,7 @@ class ChangelogGenerator:
             host=self.config.ollama_host,
             model=self.config.ollama_model
         )
-        self.git_utils = GitUtils(repo_path)
+        self.git_utils = git_utils or GitUtils(repo_path)
 
     def generate(
         self,
@@ -160,11 +161,13 @@ Group by type (feat, fix, docs, etc.) and format properly."""
 def get_changelog_generator(
     config: Optional[Config] = None,
     ollama_client: Optional[OllamaClient] = None,
+    git_utils: Optional[GitUtils] = None,
     repo_path: Optional[str] = None,
 ) -> ChangelogGenerator:
     """Get ChangelogGenerator instance."""
     return ChangelogGenerator(
         config=config,
         ollama_client=ollama_client,
+        git_utils=git_utils,
         repo_path=repo_path,
     )