feat(builder)!: remove deprecated SSE transport - Streamable HTTP only (2.0.0)

BREAKING CHANGE: GET /sse and POST /messages now answer 404. Every client
connects over Streamable HTTP at /mcp. The sse remote is removed from
server.json.

- Add unauthenticated GET /health ({status, version}); no session, no
  rate-limit touch.
- Add any-origin CORS across the whole HTTP surface, incl. OPTIONS
  preflight and error responses; mcp-session-id exposed to browsers.
- Unify every version string at 2.0.0; both McpServer identities now read
  the version from package.json at build time instead of hardcoding it.
- Raise @modelcontextprotocol/sdk floor to ^1.30.0 and sync the local
  install with the lockfile.
- Tests: retire the SSE-shaped auth-gating suite (its unique
  process-liveness test is ported to streamable-http-gating), move the
  shared harness and rate-limit suite to StreamableHTTPClientTransport,
  and add http-surface.test.ts for CORS//health//sse-404 coverage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@apexfusion/mcp-server-monorepo",
-  "version": "0.1.0",
+  "version": "2.0.0",
   "private": true,
   "type": "module",
   "workspaces": ["packages/*"],
@@ -15,7 +15,7 @@
     "test:smoke": "npm run build && node --import tsx --test packages/builder/test/smoke/*.test.ts",
     "test:smoke:signer": "npm run build && node --import tsx --test packages/signer/test/smoke/*.test.ts",
     "test:integration": "npm run build && node --import tsx --test packages/builder/test/integration/*.test.ts",
-    "test:integration:auth": "npm run build && node --import tsx --test packages/builder/test/integration/auth-gating.test.ts packages/builder/test/integration/rate-limit-gating.test.ts packages/builder/test/integration/streamable-http-gating.test.ts",
+    "test:integration:auth": "npm run build && node --import tsx --test packages/builder/test/integration/http-surface.test.ts packages/builder/test/integration/rate-limit-gating.test.ts packages/builder/test/integration/streamable-http-gating.test.ts",
     "test:integration:signer": "node --import tsx --test packages/signer/test/integration/*.test.ts"
   },
   "devDependencies": {