feat: add crewai-tools library to workspace

- Migrate crewai-tools as standalone package in lib/tools
- Configure UV workspace for monorepo structure
- Move assets to repository root
- Clean up duplicate README files
- Focus pre-commit hooks on lib/crewai/src only

.pre-commit-config.yaml

@@ -6,14 +6,17 @@ repos:
         entry: uv run ruff check
         language: system
         types: [python]
+        files: ^lib/crewai/src/
       - id: ruff-format
         name: ruff-format
         entry: uv run ruff format
         language: system
         types: [python]
+        files: ^lib/crewai/src/
       - id: mypy
         name: mypy
         entry: uv run mypy
         language: system
         types: [python]
-        exclude: ^tests/
+        files: ^lib/crewai/src/
+        exclude: ^lib/crewai/tests/