Remove HTTP server mode, keep MCP + CLI only

Drop express dependency and HTTP server in favor of MCP-only architecture.
CLI still works for quick screenshots and queries.

- Delete src/server.ts and src/server.test.ts
- Remove express, @types/express, supertest from dependencies
- Update CLI to show help when no URL provided
- Remove server exports from index.ts

-33 packages removed, 757 lines deleted.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -50,19 +50,15 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.26.0",
     "chalk": "^5.6.2",
-    "express": "^5.2.1",
     "log-symbols": "^7.0.1",
     "playwright": "^1.41.0",
     "sharp": "^0.34.5"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.9.0",
-    "@types/express": "^5.0.6",
     "@types/node": "^20.11.0",
     "@types/sharp": "^0.31.1",
-    "@types/supertest": "^6.0.3",
     "@vitest/coverage-v8": "^4.0.18",
-    "supertest": "^7.2.2",
     "typescript": "^5.3.0",
     "vitest": "^4.0.18"
   },