feat: improve memory extraction & add document-panel memory editing

[AnishSarkar22]

Description

• Refined personal and team memory protocols with clearer heading-based markdown rules, safer legacy marker handling, and updated memory-tool examples for both new chat and multi-agent flows.
• Added first-class backend memory APIs for reading, saving, resetting, and managing team memory through dedicated routes instead of direct search-space updates.
• Wired personal and team memory settings to the new memory API via shared frontend hooks, reducing duplicated settings-page state and API logic.
• Moved memory into the documents/editor panel experience with virtual MEMORY.md and TEAM_MEMORY.md entries, protected document-row actions, and normal PlateJS editing behavior.
• Updated document-panel state, memory icons/types, and editor behavior so memory can be opened and saved through the same right-panel editor flow as regular documents.
• Added a lightweight memory document parser and canonical renderer that replaces regex-only validation, preserves user-authored lines, and normalizes legacy marker bullets into the new markerless markdown format on save.
• Removed unused background memory extraction functions and related components.

Motivation and Context

FIX #

Screenshots

API Changes

• This PR includes API changes

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):

Testing Performed

• Tested locally
• Manual/QA verification

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

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