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

tests/open5e-types.test.ts

@@ -0,0 +1,63 @@
+import { describe, it, expect } from "vitest";
+import type { Monster, Spell } from "../src/lib/open5e/client";
+
+// Type-level assertions: verify interfaces contain all required fields.
+// If a listed key is missing from the interface, TypeScript will error at compile time.
+type AssertKeys<T, K extends keyof T> = K;
+
+type _MonsterHasAllFields = AssertKeys<
+  Monster,
+  | "name"
+  | "key"
+  | "challenge_rating_decimal"
+  | "type"
+  | "hit_points"
+  | "armor_class"
+  | "speed"
+  | "actions"
+  | "special_abilities"
+  | "legendary_actions"
+  | "senses"
+  | "languages"
+  | "strength"
+  | "dexterity"
+  | "constitution"
+  | "intelligence"
+  | "wisdom"
+  | "charisma"
+  | "size"
+  | "subtype"
+  | "alignment"
+  | "damage_immunities"
+  | "damage_resistances"
+  | "damage_vulnerabilities"
+  | "condition_immunities"
+>;
+
+type _SpellHasAllFields = AssertKeys<
+  Spell,
+  | "name"
+  | "key"
+  | "level"
+  | "school"
+  | "casting_time"
+  | "range"
+  | "components"
+  | "duration"
+  | "desc"
+  | "higher_level"
+  | "ritual"
+  | "concentration"
+  | "classes"
+>;
+
+// Runtime dummy test so Vitest recognizes this file.
+describe("Open5e type assertions", () => {
+  it("Monster interface contains all required keys at compile time", () => {
+    expect(true).toBe(true);
+  });
+
+  it("Spell interface contains all required keys at compile time", () => {
+    expect(true).toBe(true);
+  });
+});