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/admin/randomize-labels/route.ts

@@ -1,11 +1,16 @@
 import { NextResponse } from 'next/server';
 import prisma from '@/lib/prisma';
 import { LABEL_COLORS } from '@/lib/types';
+import { auth } from '@/auth';
 
 export const dynamic = 'force-dynamic';
 
 export async function GET() {
   try {
+    const session = await auth()
+    if (!session?.user?.id || (session.user as any).role !== 'ADMIN') {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
     const labels = await prisma.label.findMany();
     const colors = Object.keys(LABEL_COLORS).filter(c => c !== 'gray'); // Exclude gray to force colors
     

memento-note/app/api/admin/sync-labels/route.ts

@@ -1,10 +1,15 @@
 import { NextResponse } from 'next/server';
 import prisma from '@/lib/prisma';
+import { auth } from '@/auth';
 
 export const dynamic = 'force-dynamic';
 
 export async function GET() {
   try {
+    const session = await auth()
+    if (!session?.user?.id || (session.user as any).role !== 'ADMIN') {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
     // 1. Get all notes
     const notes = await prisma.note.findMany({
       select: { labels: true }