Enhance project structure and add new files for enrichment and analysis

- Updated AGENTS.md to reflect changes in CLI commands and module organization, including the addition of an enrichment step and new functional modules.
- Introduced analysis.json, identities.json, inventory.csv, and plan.json to support enriched metadata and execution planning.
- Added CODE_IMPROVEMENTS.md to document identified code issues and proposed solutions for future enhancements.
- Updated README.md to include new enrichment features and configuration options.
- Removed unused dependency on ffmpeg-python from pyproject.toml.

These changes improve the overall functionality and maintainability of the Video Library Manager project.

tests/test_cli_scan.py

@@ -27,8 +27,8 @@ categories:
     )
 
     runner = CliRunner()
-    with patch("vlm.scanner.scan_library", return_value=[]) as mock_scan, patch(
-        "vlm.scanner.save_inventory_csv"
+    with patch("vlm.commands.scan.scan_library", return_value=[]) as mock_scan, patch(
+        "vlm.commands.scan.save_inventory_csv"
     ) as mock_save:
         result = runner.invoke(
             main,
@@ -69,9 +69,9 @@ categories:
     )
 
     runner = CliRunner()
-    with patch("vlm.scanner.load_inventory_csv") as mock_load_cache, patch(
-        "vlm.scanner.scan_library", return_value=[]
-    ) as mock_scan, patch("vlm.scanner.save_inventory_csv") as mock_save:
+    with patch("vlm.commands.scan.load_inventory_csv") as mock_load_cache, patch(
+        "vlm.commands.scan.scan_library", return_value=[]
+    ) as mock_scan, patch("vlm.commands.scan.save_inventory_csv") as mock_save:
         result = runner.invoke(
             main,
             [