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/components/settings/SettingsSearch.tsx

@@ -0,0 +1,101 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import { Search, X } from 'lucide-react'
+import { Input } from '@/components/ui/input'
+import { cn } from '@/lib/utils'
+
+export interface Section {
+  id: string
+  label: string
+  description: string
+  icon: React.ReactNode
+  href: string
+}
+
+interface SettingsSearchProps {
+  sections: Section[]
+  onFilter: (filteredSections: Section[]) => void
+  placeholder?: string
+  className?: string
+}
+
+export function SettingsSearch({
+  sections,
+  onFilter,
+  placeholder = 'Search settings...',
+  className
+}: SettingsSearchProps) {
+  const [query, setQuery] = useState('')
+  const [filteredSections, setFilteredSections] = useState<Section[]>(sections)
+
+  useEffect(() => {
+    if (!query.trim()) {
+      setFilteredSections(sections)
+      return
+    }
+
+    const queryLower = query.toLowerCase()
+    const filtered = sections.filter(section => {
+      const labelMatch = section.label.toLowerCase().includes(queryLower)
+      const descMatch = section.description.toLowerCase().includes(queryLower)
+      return labelMatch || descMatch
+    })
+    setFilteredSections(filtered)
+  }, [query, sections])
+
+  const handleClearSearch = () => {
+    setQuery('')
+    setFilteredSections(sections)
+  }
+
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        handleClearSearch()
+        e.stopPropagation()
+      }
+    }
+
+    document.addEventListener('keydown', handleKeyDown)
+    return () => {
+      document.removeEventListener('keydown', handleKeyDown)
+    }
+  }, [])
+
+  const handleSearchChange = (value: string) => {
+    setQuery(value)
+  }
+
+  const hasResults = query.trim() && filteredSections.length < sections.length
+  const isEmptySearch = query.trim() && filteredSections.length === 0
+
+  return (
+    <div className={cn('relative', className)}>
+      <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-gray-400" />
+      <Input
+        type="text"
+        value={query}
+        onChange={(e) => handleSearchChange(e.target.value)}
+        placeholder={placeholder}
+        className="pl-10"
+        autoFocus
+      />
+      {hasResults && (
+        <button
+          type="button"
+          onClick={handleClearSearch}
+          className="absolute right-2 top-1/2 text-gray-400 hover:text-gray-600"
+          aria-label="Clear search"
+        >
+          <X className="h-4 w-4" />
+        </button>
+      )}
+      {isEmptySearch && (
+        <div className="absolute top-full left-0 right-0 mt-1 p-2 bg-white rounded-lg shadow-lg border z-50">
+          <p className="text-sm text-gray-600">No settings found</p>
+        </div>
+      )}
+    </div>
+  )
+}