feat: one-click cookie import from browser

New: agent-eyes configure --from-browser chrome
- Extracts Twitter, XiaoHongShu, Bilibili cookies in ONE command
- No F12, no manual copying, no extension needed
- Supports: chrome, firefox, edge, brave, opera
- Uses browser-cookie3 (optional dependency: pip install agent-eyes[cookies])

Install guide now 3x shorter:
1. pip install + agent-eyes install (auto-detect env)
2. agent-eyes configure --from-browser chrome (one-click all cookies)
3. agent-eyes configure exa-key KEY (one API key)
4. Done

User actions reduced from 4 trips to 2:
- Before: go to exa.ai + F12 Twitter + F12 XHS + go to webshare.io
- After: go to exa.ai + say 'yes' to auto-import cookies

pyproject.toml

@@ -30,8 +30,9 @@ dependencies = [
 
 [project.optional-dependencies]
 browser = ["playwright>=1.40"]
+cookies = ["browser-cookie3>=0.19"]
 mcp = ["mcp[cli]>=1.0"]
-all = ["playwright>=1.40", "mcp[cli]>=1.0"]
+all = ["playwright>=1.40", "mcp[cli]>=1.0", "browser-cookie3>=0.19"]
 
 [project.scripts]
 agent-eyes = "agent_eyes.cli:main"