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>

memento-note/app/api/debug/config/route.ts

@@ -0,0 +1,32 @@
+import { NextResponse } from 'next/server';
+import { getSystemConfig } from '@/lib/config';
+
+/**
+ * Debug endpoint to check AI configuration
+ * This helps verify that OpenAI is properly configured
+ */
+export async function GET() {
+  try {
+    const config = await getSystemConfig();
+
+    // Return only AI-related config for debugging
+    const aiConfig = {
+      AI_PROVIDER_TAGS: config.AI_PROVIDER_TAGS || 'not set',
+      AI_PROVIDER_EMBEDDING: config.AI_PROVIDER_EMBEDDING || 'not set',
+      AI_MODEL_TAGS: config.AI_MODEL_TAGS || 'not set',
+      AI_MODEL_EMBEDDING: config.AI_MODEL_EMBEDDING || 'not set',
+      OPENAI_API_KEY: config.OPENAI_API_KEY ? 'set (hidden)' : 'not set',
+      OLLAMA_BASE_URL: config.OLLAMA_BASE_URL || 'not set',
+      OLLAMA_MODEL: config.OLLAMA_MODEL || 'not set',
+      CUSTOM_OPENAI_BASE_URL: config.CUSTOM_OPENAI_BASE_URL || 'not set',
+      CUSTOM_OPENAI_API_KEY: config.CUSTOM_OPENAI_API_KEY ? 'set (hidden)' : 'not set',
+    };
+
+    return NextResponse.json(aiConfig);
+  } catch (error) {
+    return NextResponse.json(
+      { error: 'Failed to get config', details: error },
+      { status: 500 }
+    );
+  }
+}