feat(dm-dashboard): Wave 1 — auth fixes, DB schema, Open5e interfaces, AI clients

- Fix auth anti-patterns (JWT, OAuth, logout, middleware, url.origin)
- Extend DB schema with tier, npcs, counters, translations, notes, initiative
- Expand Open5e TypeScript interfaces (Monster, Spell) to full V2
- Build OpenRouter API client for FREE tier
- Build Kimi API client for PRO tier
- Add comprehensive tests for all modules

vitest.config.ts

@@ -5,6 +5,7 @@ export default defineConfig({
   resolve: {
     alias: {
       "@": path.resolve(import.meta.dirname, "./src"),
+      "astro:middleware": path.resolve(import.meta.dirname, "./tests/mocks/astro-middleware.ts"),
     },
   },
   test: {