DB-first library reads, mixed library indexing, and manual NFO refresh

- API reads now serve from media_items cache instead of scanning the filesystem
  on every request; scans (manual or scheduled) remain the write path
- NFO metadata is no longer parsed automatically during scans; title falls back
  to folder/filename — metadata can be refreshed per-item via the kabob menu
- Mixed libraries are now indexed in media_items (new mixed_file item type)
  with file_path stored; scanMixed walks recursively and upserts all files
- Added file_path column to media_items and migrated item_type CHECK constraint
  to include mixed_file via safe table-recreation migration
- New POST /api/nfo-refresh endpoint reads the .nfo for a single item and
  patches its DB row (supports movie, tv_series, tv_episode)
- Added "Refresh metadata" button to movie and TV series kabob menus

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/games.ts

@@ -1,6 +1,7 @@
 import fs from 'fs'
 import path from 'path'
 import type { Game, GameSeries } from '@/types'
+import { getDb } from './db'
 import { HIDDEN_FILES, fileApiUrl, thumbnailApiUrl, findFile } from './media-utils'
 
 /**
@@ -119,3 +120,64 @@ export function scanGamesLibrary(libraryRoot: string, libraryId: string): (Game
 
   return results.sort((a, b) => a.title.localeCompare(b.title))
 }
+
+export function gamesFromDb(libraryId: string): (Game | GameSeries)[] {
+  const db = getDb()
+
+  type DbRow = {
+    item_key: string
+    item_type: string
+    parent_key: string | null
+    title: string | null
+    metadata: string | null
+  }
+
+  const allRows = db
+    .prepare(`SELECT item_key, item_type, parent_key, title, metadata
+              FROM media_items
+              WHERE library_id = ? AND item_type IN ('game', 'game_series')
+              ORDER BY title`)
+    .all(libraryId) as DbRow[]
+
+  const seriesMap = new Map<string, GameSeries>()
+  const standaloneGames: Game[] = []
+
+  // First pass: build series
+  for (const row of allRows) {
+    if (row.item_type !== 'game_series') continue
+    const meta = row.metadata ? JSON.parse(row.metadata) : {}
+    const idPart = row.item_key.split(':game_series:')[1] ?? row.item_key
+    seriesMap.set(row.item_key, {
+      id: idPart,
+      title: row.title ?? decodeURIComponent(idPart),
+      coverUrl: meta.coverUrl ?? null,
+      wideCoverUrl: meta.wideCoverUrl ?? null,
+      games: [],
+    })
+  }
+
+  // Second pass: attach games
+  for (const row of allRows) {
+    if (row.item_type !== 'game') continue
+    const meta = row.metadata ? JSON.parse(row.metadata) : {}
+    const idPart = row.item_key.split(':game:')[1] ?? row.item_key
+    const game: Game = {
+      id: idPart,
+      title: row.title ?? decodeURIComponent(idPart),
+      coverUrl: meta.coverUrl ?? null,
+      wideCoverUrl: meta.wideCoverUrl ?? null,
+      zipFiles: meta.zipFiles ?? [],
+    }
+    if (row.parent_key && seriesMap.has(row.parent_key)) {
+      seriesMap.get(row.parent_key)!.games.push(game)
+    } else {
+      standaloneGames.push(game)
+    }
+  }
+
+  const results: (Game | GameSeries)[] = [
+    ...Array.from(seriesMap.values()),
+    ...standaloneGames,
+  ]
+  return results.sort((a, b) => a.title.localeCompare(b.title))
+}