feat: rename keep-notes to memento-note, migrate to PostgreSQL, fix MCP bugs

- Rename directory keep-notes -> memento-note with all code references
- Prisma: SQLite -> PostgreSQL (both app and MCP server schemas)
- Sync MCP schema with main app (add missing fields, relations, indexes)
- Delete 17 SQLite migrations (clean slate for PostgreSQL)
- Remove SQLite dependencies (@libsql/client, better-sqlite3, etc.)
- Fix MCP server: hardcoded Windows DB paths -> DATABASE_URL env var
- Fix MCP server: .dockerignore excluded index-sse.js (SSE mode broken)
- MCP Dockerfile: node:20 -> node:22
- Docker Compose: add postgres service, remove SQLite volume
- Generate favicon.ico, icon-192.png, icon-512.png, apple-icon.png
- Update layout.tsx icons and manifest.json for PNG icons
- Update all .env files for PostgreSQL
- Rewrite README.md with updated sections
- Remove mcp-server/node_modules and prisma/client-generated from git tracking

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

docker-compose.yml

@@ -1,10 +1,34 @@
 services:
   # ============================================
-  # keep-notes - Next.js Web Application
+  # PostgreSQL - Database
   # ============================================
-  keep-notes:
+  postgres:
+    image: postgres:16-alpine
+    container_name: memento-postgres
+    ports:
+      - "${POSTGRES_PORT:-5432}:5432"
+    environment:
+      - POSTGRES_DB=${POSTGRES_DB:-memento}
+      - POSTGRES_USER=${POSTGRES_USER:-memento}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-memento}
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-memento}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 10s
+    networks:
+      - memento-network
+
+  # ============================================
+  # memento-note - Next.js Web Application
+  # ============================================
+  memento-note:
     build:
-      context: ./keep-notes
+      context: ./memento-note
       dockerfile: Dockerfile
     container_name: memento-web
     env_file:
@@ -12,7 +36,7 @@ services:
     ports:
       - "3000:3000"
     environment:
-      - DATABASE_URL=file:/app/prisma/dev.db
+      - DATABASE_URL=postgresql://${POSTGRES_USER:-memento}:${POSTGRES_PASSWORD:-memento}@postgres:5432/${POSTGRES_DB:-memento}
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET:-changethisinproduction}
       - NEXTAUTH_URL=${NEXTAUTH_URL:-http://localhost:3000}
       - NODE_ENV=production
@@ -34,8 +58,10 @@ services:
       - AI_MODEL_TAGS=${AI_MODEL_TAGS}
       - AI_MODEL_EMBEDDING=${AI_MODEL_EMBEDDING}
     volumes:
-      - db-data:/app/prisma
       - uploads-data:/app/public/uploads
+    depends_on:
+      postgres:
+        condition: service_healthy
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "wget", "--spider", "-q", "http://localhost:3000"]
@@ -71,14 +97,10 @@ services:
       # Mode: 'stdio' (default, for Claude Desktop) or 'sse' (for HTTP/N8N)
       - MCP_MODE=${MCP_MODE:-stdio}
       - PORT=${MCP_PORT:-3001}
-      # Database path - must match the volume mount
-      - DATABASE_URL=file:/app/db/dev.db
+      - DATABASE_URL=postgresql://${POSTGRES_USER:-memento}:${POSTGRES_PASSWORD:-memento}@postgres:5432/${POSTGRES_DB:-memento}
       - NODE_ENV=production
-    volumes:
-      # Shared database with keep-notes
-      - db-data:/app/db
     depends_on:
-      keep-notes:
+      postgres:
         condition: service_healthy
     restart: unless-stopped
     networks:
@@ -119,7 +141,7 @@ services:
 # Volumes - Data Persistence
 # ============================================
 volumes:
-  db-data:
+  postgres-data:
     driver: local
   uploads-data:
     driver: local