feat(browser): add Camofox local anti-detection browser backend (#4008)

Camofox-browser is a self-hosted Node.js server wrapping Camoufox
(Firefox fork with C++ fingerprint spoofing). When CAMOFOX_URL is set,
all 11 browser tools route through the Camofox REST API instead of
the agent-browser CLI.

Maps 1:1 to the existing browser tool interface:
- Navigate, snapshot, click, type, scroll, back, press, close
- Get images, vision (screenshot + LLM analysis)
- Console (returns empty with note — camofox limitation)

Setup: npm start in camofox-browser dir, or docker run -p 9377:9377
Then: CAMOFOX_URL=http://localhost:9377 in ~/.hermes/.env

Advantages over Browserbase (cloud):
- Free (no per-session API costs)
- Local (zero network latency for browser ops)
- Anti-detection at C++ level (bypasses Cloudflare/Google bot detection)
- Works offline, Docker-ready

Files:
- tools/browser_camofox.py: Full REST backend (~400 lines)
- tools/browser_tool.py: Routing at each tool function
- hermes_cli/config.py: CAMOFOX_URL env var entry
- tests/tools/test_browser_camofox.py: 20 tests

hermes_cli/config.py

@@ -706,6 +706,14 @@ OPTIONAL_ENV_VARS = {
         "password": True,
         "category": "tool",
     },
+    "CAMOFOX_URL": {
+        "description": "Camofox browser server URL for local anti-detection browsing (e.g. http://localhost:9377)",
+        "prompt": "Camofox server URL",
+        "url": "https://github.com/jo-inc/camofox-browser",
+        "tools": ["browser_navigate", "browser_click"],
+        "password": False,
+        "category": "tool",
+    },
     "FAL_KEY": {
         "description": "FAL API key for image generation",
         "prompt": "FAL API key",