fix: comprehensive security, consistency, and dead code cleanup

Security:
- Add auth + file type/size validation to upload API
- Add admin auth to /api/admin/ endpoints
- Add SSRF protection to scrape action
- Whitelist fields in PUT /api/notes/[id] to prevent mass assignment
- Protect /lab, /agents, /chat, /canvas, /notebooks routes in middleware

AI provider fixes:
- Add deepseek/openrouter to factory ProviderType (was silently falling back to ollama)
- Fix title-suggestion.service.ts to use factory instead of hardcoded OpenAI
- Fix getAIProvider→getChatProvider in memory-echo, notebook-summary, agent-executor
- Fix getAIProvider→getTagsProvider in notebook-suggestion, title-suggestions, transform-markdown

Functional bugs:
- Fix ALLOW_REGISTRATION AND→OR logic
- Fix note-editor.tsx passing stale props to useAutoTagging instead of local state
- Fix stale Note.embedding type (migrated to NoteEmbedding table)
- Remove hardcoded SQLite path from prisma.ts

Frontend:
- Add AbortController to useAutoTagging and useTitleSuggestions hooks
- Add error rollback to optimistic UI in note-inline-editor
- Remove stale closure over notebookId/language in useAutoTagging

Cleanup:
- Rename docker-compose from keepnotes→memento
- Remove unused unstable_cache import from config.ts
- Remove dead useUndoRedo hook
- Fix TagSuggestion type (add isNewLabel, reasoning)
- Remove dead AIConfig/AIProviderType types
- Fix ghost-tags unused isEmpty var and as any cast
- Fix note-editor titleSuggestions typed as any[]

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/app/api/notes/[id]/route.ts

@@ -94,7 +94,14 @@ export async function PUT(
     }
 
     const body = await request.json()
-    const updateData: any = { ...body }
+    // Whitelist allowed fields to prevent mass assignment
+    const allowedFields = ['title', 'content', 'color', 'isPinned', 'isArchived', 'type', 'isMarkdown', 'size', 'notebookId']
+    const updateData: Record<string, any> = {}
+    for (const key of allowedFields) {
+      if (key in body) {
+        updateData[key] = body[key]
+      }
+    }
 
     if ('checkItems' in body) {
       updateData.checkItems = body.checkItems ?? null