Add memory editing API endpoint, MCP tool, and memory IDs in prompts

- Add get_long_term_memory_by_id and update_long_term_memory functions
- Add EditMemoryRecordRequest model for partial updates
- Add REST API endpoints: GET and PATCH /v1/long-term-memory/{memory_id}
- Add MCP tools: get_long_term_memory and edit_long_term_memory
- Include memory IDs in memory prompts for LLM editing capability
- Support updating text, topics, entities, memory_type, namespace, user_id, session_id, event_date
- Add validation and error handling for invalid fields
- Maintain audit trail with updated_at timestamps

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: abrookins