feat(api): implement notebook management CRUD endpoints

Implement Sprint 1: Notebook Management CRUD

- Add NotebookService with full CRUD operations
- Add POST /api/v1/notebooks (create notebook)
- Add GET /api/v1/notebooks (list with pagination)
- Add GET /api/v1/notebooks/{id} (get by ID)
- Add PATCH /api/v1/notebooks/{id} (partial update)
- Add DELETE /api/v1/notebooks/{id} (delete)
- Add Pydantic models for requests/responses
- Add custom exceptions (ValidationError, NotFoundError, NotebookLMError)
- Add comprehensive unit tests (31 tests, 97% coverage)
- Add API integration tests (26 tests)
- Fix router prefix duplication
- Fix JSON serialization in error responses

BREAKING CHANGE: None

.pre-commit-config.yaml

@@ -0,0 +1,61 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+
+repos:
+  # General file checks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+        exclude: ^(tests/fixtures/|docs/)
+      - id: end-of-file-fixer
+        exclude: ^(tests/fixtures/|docs/)
+      - id: check-yaml
+      - id: check-added-large-files
+        args: ['--maxkb=1000']
+      - id: check-json
+      - id: check-toml
+      - id: check-merge-conflict
+      - id: debug-statements
+      - id: mixed-line-ending
+
+  # Ruff - Python linter and formatter
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.8.6
+    hooks:
+      # Run the linter
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^(src/|tests/)
+      # Run the formatter
+      - id: ruff-format
+        files: ^(src/|tests/)
+
+  # MyPy - Type checking
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.8.0
+    hooks:
+      - id: mypy
+        additional_dependencies:
+          - pydantic>=2.0.0
+          - pydantic-settings>=2.0.0
+          - types-python-jose
+          - types-passlib
+        args: [--strict, --ignore-missing-imports]
+        files: ^src/
+        exclude: ^(tests/|scripts/)
+
+  # Commit message validation
+  - repo: https://github.com/commitizen-tools/commitizen
+    rev: v3.13.0
+    hooks:
+      - id: commitizen
+        stages: [commit-msg]
+
+  # Security checks
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v1.4.0
+    hooks:
+      - id: detect-secrets
+        args: ['--baseline', '.secrets.baseline']
+        exclude: ^(tests/|docs/|\.env\.example)