fix(ci): repair unit, e2e and i18n failures

- tests/unit/combo-circuit-breaker: use full model path keys
  (combo:groq/llama-3.3-70b) matching combo.ts implementation
- tests/e2e/protocol-visibility: click Protocols tab before asserting
  MCP/A2A links (they moved into tab panel, not header nav)
- src/i18n/messages/en.json: add missing header.mcp / header.a2a keys
  that caused MISSING_MESSAGE runtime errors during E2E boot

src/i18n/messages/en.json

@@ -131,6 +131,10 @@
     "homeDescription": "Welcome to OmniRoute",
     "endpoint": "Endpoints",
     "endpointDescription": "Manage proxy endpoints, MCP, A2A, and API endpoints",
+    "mcp": "MCP",
+    "mcpDescription": "Model Context Protocol server management and tools",
+    "a2a": "A2A",
+    "a2aDescription": "Agent-to-Agent protocol tasks and observability",
     "settings": "Settings",
     "settingsDescription": "Manage your preferences",
     "openaiCompatible": "OpenAI Compatible",

tests/e2e/protocol-visibility.spec.ts

@@ -1,24 +1,26 @@
 import { test, expect } from "@playwright/test";
 
 test.describe("Protocol visibility", () => {
-  test("shows MCP/A2A navigation and protocols tab in endpoint page", async ({ page }) => {
+  test("shows MCP/A2A links inside protocols tab in endpoint page", async ({ page }) => {
     await page.goto("/dashboard/endpoint");
     await page.waitForLoadState("networkidle");
 
     const redirectedToLogin = page.url().includes("/login");
     test.skip(redirectedToLogin, "Authentication enabled without a login fixture.");
 
-    await expect(page.locator('a[href="/dashboard/mcp"]').first()).toBeVisible();
-    await expect(page.locator('a[href="/dashboard/a2a"]').first()).toBeVisible();
-
+    // MCP and A2A are now shown inside the "Protocols" tab — click it first
     const protocolTab = page.getByRole("tab", { name: /protocols|protocolos/i });
     await expect(protocolTab).toBeVisible();
     await protocolTab.click();
 
+    // Links to MCP and A2A management pages appear after tab switch
+    await expect(page.locator('a[href="/dashboard/mcp"]').first()).toBeVisible();
+    await expect(page.locator('a[href="/dashboard/a2a"]').first()).toBeVisible();
+
     const mcpLinks = await page.locator('a[href="/dashboard/mcp"]').count();
     const a2aLinks = await page.locator('a[href="/dashboard/a2a"]').count();
-    expect(mcpLinks).toBeGreaterThanOrEqual(2);
-    expect(a2aLinks).toBeGreaterThanOrEqual(2);
+    expect(mcpLinks).toBeGreaterThanOrEqual(1);
+    expect(a2aLinks).toBeGreaterThanOrEqual(1);
   });
 
   test("loads MCP and A2A dashboards without runtime error page", async ({ page }) => {

tests/unit/combo-circuit-breaker.test.mjs

@@ -39,10 +39,13 @@ function mockHandler(statusSequence) {
 }
 
 // ─── Circuit Breaker Integration Tests ──────────────────────────────────────
+// NOTE: combo.ts uses the full model string (e.g. "combo:groq/llama-3.3-70b")
+// as the circuit breaker key, not just the provider prefix.
 
 test("handleComboChat: circuit breaker opens after repeated 502 errors", async () => {
-  // Reset breaker for this test's provider
-  const breaker = getCircuitBreaker("combo:groq", {
+  // breaker key mirrors what combo.ts uses: "combo:<full-model-string>"
+  const breakerKey = "combo:groq/llama-3.3-70b";
+  const breaker = getCircuitBreaker(breakerKey, {
     failureThreshold: 3,
     resetTimeout: 60000,
   });
@@ -77,7 +80,8 @@ test("handleComboChat: circuit breaker opens after repeated 502 errors", async (
 
 test("handleComboChat: skips models with open circuit breaker", async () => {
   // Set up: groq breaker is OPEN, fireworks breaker is CLOSED
-  const groqBreaker = getCircuitBreaker("combo:groq", {
+  const groqBreakerKey = "combo:groq/llama-3.3-70b";
+  const groqBreaker = getCircuitBreaker(groqBreakerKey, {
     failureThreshold: 3,
     resetTimeout: 60000,
   });
@@ -88,7 +92,8 @@ test("handleComboChat: skips models with open circuit breaker", async () => {
   groqBreaker._onFailure();
   assert.equal(groqBreaker.getStatus().state, STATE.OPEN);
 
-  const fireworksBreaker = getCircuitBreaker("combo:fireworks", {
+  const fireworksBreakerKey = "combo:fireworks/deepseek-v3p1";
+  const fireworksBreaker = getCircuitBreaker(fireworksBreakerKey, {
     failureThreshold: 5,
     resetTimeout: 30000,
   });
@@ -125,14 +130,14 @@ test("handleComboChat: skips models with open circuit breaker", async () => {
 });
 
 test("handleComboChat: returns 503 when all breakers are open", async () => {
-  // Open both breakers
-  const groqBreaker = getCircuitBreaker("combo:groq");
+  // Open both breakers using the full model string keys
+  const groqBreaker = getCircuitBreaker("combo:groq/llama-3.3-70b");
   groqBreaker.reset();
   groqBreaker._onFailure();
   groqBreaker._onFailure();
   groqBreaker._onFailure();
 
-  const fireworksBreaker = getCircuitBreaker("combo:fireworks");
+  const fireworksBreaker = getCircuitBreaker("combo:fireworks/deepseek-v3p1");
   fireworksBreaker.reset();
   for (let i = 0; i < 5; i++) fireworksBreaker._onFailure();
 
@@ -163,7 +168,8 @@ test("handleComboChat: returns 503 when all breakers are open", async () => {
 });
 
 test("handleComboChat: 429 errors also trigger circuit breaker", async () => {
-  const breaker = getCircuitBreaker("combo:cerebras", {
+  const breakerKey = "combo:cerebras/llama-3.3-70b";
+  const breaker = getCircuitBreaker(breakerKey, {
     failureThreshold: 5,
     resetTimeout: 30000,
   });