feat: add wave2 free-tier provider registries

open-sse/config/providers/registry/literouter/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+export const literouterProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "literouter",
+  alias: "literouter",
+  baseUrl: "https://api.literouter.com/v1/chat/completions",
+  modelsUrl: "https://api.literouter.com/v1/models",
+  models: [],
+  passthroughModels: true,
+});

open-sse/config/providers/registry/meganova/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+export const meganovaProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "meganova",
+  alias: "meganova",
+  baseUrl: "https://api.meganova.ai/v1/chat/completions",
+  modelsUrl: "https://api.meganova.ai/v1/models",
+  models: [],
+  passthroughModels: true,
+});

open-sse/config/providers/registry/mnn-ai/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+export const mnnAiProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "mnn-ai",
+  alias: "mnn-ai",
+  baseUrl: "https://api.mnnai.ru/v1/chat/completions",
+  modelsUrl: "https://api.mnnai.ru/v1/models",
+  models: [],
+  passthroughModels: true,
+});

tests/unit/free-tier-providers-wave2-a.test.ts

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+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { literouterProvider } from "../../open-sse/config/providers/registry/literouter/index.ts";
+import { meganovaProvider } from "../../open-sse/config/providers/registry/meganova/index.ts";
+import { mnnAiProvider } from "../../open-sse/config/providers/registry/mnn-ai/index.ts";
+import type { RegistryEntry } from "../../open-sse/config/providers/shared.ts";
+
+const providers: Array<{
+  entry: RegistryEntry;
+  id: string;
+  chatUrl: string;
+  modelsUrl: string;
+}> = [
+  {
+    entry: literouterProvider,
+    id: "literouter",
+    chatUrl: "https://api.literouter.com/v1/chat/completions",
+    modelsUrl: "https://api.literouter.com/v1/models",
+  },
+  {
+    entry: mnnAiProvider,
+    id: "mnn-ai",
+    chatUrl: "https://api.mnnai.ru/v1/chat/completions",
+    modelsUrl: "https://api.mnnai.ru/v1/models",
+  },
+  {
+    entry: meganovaProvider,
+    id: "meganova",
+    chatUrl: "https://api.meganova.ai/v1/chat/completions",
+    modelsUrl: "https://api.meganova.ai/v1/models",
+  },
+];
+
+for (const { entry, id, chatUrl, modelsUrl } of providers) {
+  test(`${id} uses an OpenAI-compatible Bearer registry entry`, () => {
+    assert.equal(entry.id, id);
+    assert.equal(entry.alias, id);
+    assert.equal(entry.format, "openai");
+    assert.equal(entry.executor, "default");
+    assert.equal(entry.authType, "apikey");
+    assert.equal(entry.authHeader, "bearer");
+    assert.equal(entry.baseUrl, chatUrl);
+    assert.equal(entry.modelsUrl, modelsUrl);
+    assert.equal(entry.passthroughModels, true);
+  });
+
+  test(`${id} leaves model discovery to the live upstream catalog`, () => {
+    assert.deepEqual(entry.models, []);
+  });
+}