feat(docs): add comprehensive Google Docs editing capabilities

Add full document editing and manipulation support to Google Docs tools,
expanding beyond read-only operations to match Google Docs API capabilities.

Features added:
- Text operations: update_doc_text, find_and_replace_doc, format_doc_text
- Structural elements: insert_doc_elements, insert_doc_image
- Document management: update_doc_headers_footers, batch_update_doc
- Helper functions module for common document operations

Changes:
- gdocs/docs_tools.py: Add 7 new editing functions with comprehensive error handling
- gdocs/docs_helpers.py: New helper module with utility functions for document operations
- README.md: Update Google Docs description to include full editing capabilities
- CLAUDE.md: Add comprehensive documentation for new editing features
- .mcp.json: Add MCP server configuration file
- .gitignore: Resolve merge conflicts from upstream sync
- uv.lock: Update dependencies from upstream merge

The implementation uses Google Docs API batchUpdate operations for atomic
document modifications and maintains compatibility with existing authentication
and error handling patterns.

All new tools follow the established @require_google_service decorator pattern
and include proper scope management for write operations.

README.md

@@ -59,7 +59,7 @@ A production-ready MCP server that integrates all major Google Workspace service
 - **📅 Google Calendar**: Full calendar management with event CRUD operations
 - **📁 Google Drive**: File operations with native Microsoft Office format support (.docx, .xlsx)
 - **📧 Gmail**: Complete email management with search, send, and draft capabilities
-- **📄 Google Docs**: Document operations including content extraction, creation, and comment management
+- **📄 Google Docs**: Complete document management including content extraction, creation, full editing capabilities, and comment management
 - **📊 Google Sheets**: Comprehensive spreadsheet management with flexible cell operations and comment management
 - **🖼️ Google Slides**: Presentation management with slide creation, updates, content manipulation, and comment management
 - **📝 Google Forms**: Form creation, retrieval, publish settings, and response management
@@ -499,6 +499,13 @@ When calling a tool:
 | `get_doc_content` | Extract document text |
 | `list_docs_in_folder` | List docs in folder |
 | `create_doc` | Create new documents |
+| `update_doc_text` | Insert or replace text at specific positions |
+| `find_and_replace_doc` | Find and replace text throughout document |
+| `format_doc_text` | Apply text formatting (bold, italic, underline, fonts) |
+| `insert_doc_elements` | Add tables, lists, or page breaks |
+| `insert_doc_image` | Insert images from Drive or URLs |
+| `update_doc_headers_footers` | Modify document headers and footers |
+| `batch_update_doc` | Execute multiple document operations atomically |
 | `read_doc_comments` | Read all comments and replies |
 | `create_doc_comment` | Create new comments |
 | `reply_to_comment` | Reply to existing comments |