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/lib/theme-script.ts

@@ -0,0 +1,31 @@
+export function getThemeScript(theme: string = 'light') {
+  return `
+    (function() {
+      try {
+        var localTheme = localStorage.getItem('theme-preference');
+        var theme = localTheme || '${theme}';
+        var root = document.documentElement;
+        
+        root.classList.remove('dark');
+        root.removeAttribute('data-theme');
+
+        if (theme === 'auto') {
+          if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+            root.classList.add('dark');
+          }
+        } else if (theme === 'dark') {
+          root.classList.add('dark');
+        } else if (theme === 'light') {
+          // do nothing
+        } else {
+          root.setAttribute('data-theme', theme);
+          if (theme === 'midnight') {
+            root.classList.add('dark');
+          }
+        }
+      } catch (e) {
+        console.error('Theme script error', e);
+      }
+    })();
+  `
+}