fix: resolve Next.js 16 build errors

- Extract Elysia app from route.ts into lib/api/app.ts to avoid
  Next.js 16 invalid export validation ('app' is not a valid route
  export field)
- Remove runtime='nodejs' from opengraph-image.tsx (invalid segment
  config in Next.js 16)
- Replace computed revalidate expression in sitemap.ts with literal
  (Next.js cannot statically evaluate BinaryExpression for segment
  configs)
- Update eden.ts imports to match new app.ts location

app/api/[[...slugs]]/route.ts

@@ -1,131 +1,7 @@
-import { Elysia } from "elysia"
-import { auth } from "@/lib/auth"
-import { rateLimit } from "@/lib/auth/rate-limit"
-import {
-  healthRoutes,
-  userRoutes,
-  gamesRoutes,
-  gameVersionsRoutes,
-  gameSyncRoutes,
-  hardwareRoutes,
-  hardwareStatsRoutes,
-  performanceRoutes,
-  performanceVerifyRoutes,
-  performanceSubmitRoutes,
-  commentsRoutes,
-  savedGamesRoutes,
-  reportRoutes,
-  contactRoutes,
-  adminReportRoutes,
-  adminPerformanceRoutes,
-  adminCommentRoutes,
-} from "@/lib/api"
-import { steamSearchRoutes } from "@/lib/api/steam-search"
-import { searchUnifiedRoutes } from "@/lib/api/search-unified"
-import { gameStubRoutes } from "@/lib/api/game-stub"
-import { gameStatsRoutes } from "@/lib/api/game-stats"
-import { gamesManualRoutes } from "@/lib/api/games-manual"
-import { compareRoutes } from "@/lib/api/compare"
-import { playabilityRoutes } from "@/lib/api/playability"
-import { steamReviewRoutes } from "@/lib/api/steam-reviews"
-import { communitySuggestionRoutes } from "@/lib/api/community-suggestions"
-import { gamesListingRoutes } from "@/lib/api/games-listing"
-import { steamgridProxyRoutes } from "@/lib/api/steamgrid-proxy"
-import { dashboardRoutes } from "@/lib/api/dashboard"
-import { savedFilterRoutes } from "@/lib/api/saved-filters"
-
-const betterAuth = new Elysia({ name: "better-auth" })
-  .mount(auth.handler)
-  .macro({
-    auth: {
-      async resolve({ status, request: { headers } }) {
-        const session = await auth.api.getSession({
-          headers,
-        })
-
-        if (!session) return status(401)
-
-        return {
-          user: session.user,
-          session: session.session,
-        }
-      },
-    },
-  })
-
-export const app = new Elysia({ prefix: "/api" })
-  .onError(({ code, error, set, request }) => {
-    console.error(
-      `[API Error] ${code} ${request.url}`,
-      error instanceof Error ? error.message : error,
-    )
-    set.status = code === "NOT_FOUND" ? 404 : 500
-    return {
-      error: code === "NOT_FOUND" ? "Not found" : "Internal server error",
-    }
-  })
-  .use(rateLimit(60, 100))
-  .use(betterAuth)
-  // Health
-  .use(healthRoutes)
-  // Users
-  .use(userRoutes)
-  // Games + Versions
-  .use(gamesRoutes)
-  .use(gameVersionsRoutes)
-  .use(gameSyncRoutes)
-  .use(gamesListingRoutes)
-  // Hardware
-  .use(hardwareRoutes)
-  .use(hardwareStatsRoutes)
-  // Performance
-  .use(performanceRoutes)
-  .use(performanceVerifyRoutes)
-  .use(performanceSubmitRoutes)
-  .use(reportRoutes)
-  .use(adminReportRoutes)
-  .use(adminPerformanceRoutes)
-  .use(adminCommentRoutes)
-  // Comments
-  .use(commentsRoutes)
-  // Steam search proxy
-  .use(steamSearchRoutes)
-  // Unified search
-  .use(searchUnifiedRoutes)
-  // Game stub creation
-  .use(gameStubRoutes)
-  // SteamGridDB proxy
-  .use(steamgridProxyRoutes)
-  // Game stats aggregation
-  .use(gameStatsRoutes)
-  // Manual game creation
-  .use(gamesManualRoutes)
-  // Saved games
-  .use(savedGamesRoutes)
-  // Contact form
-  .use(contactRoutes)
-  // Compare
-  .use(compareRoutes)
-  // Playability
-  .use(playabilityRoutes)
-  // Steam reviews
-  .use(steamReviewRoutes)
-  // Community suggestions
-  .use(communitySuggestionRoutes)
-  // Saved filters
-  .use(savedFilterRoutes)
-  // Dashboard
-  .use(dashboardRoutes)
-  // Root
-  .get("/", () => ({
-    name: "DeckyVault API",
-    version: "2026.0.9",
-  }))
+import { app } from "@/lib/api/app"
 
 export const GET = app.fetch
 export const POST = app.fetch
 export const PUT = app.fetch
 export const DELETE = app.fetch
 export const PATCH = app.fetch
-
-export type App = typeof app