chore(cspell): clean up custom dictionary and ignore .claude directory

- Add .claude directory to ignorePaths
- Remove unused words from custom dictionary (gemini, aicodingstack, dedup, npmjs, Gitea, signup)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: ericyangpan

cspell.json

@@ -31,7 +31,7 @@
     }
   ],
   "useGitignore": true,
-  "ignorePaths": ["cloudflare-env.d.ts", "docs"],
+  "ignorePaths": ["cloudflare-env.d.ts", "docs", ".claude"],
   "words": [
     "agentic",
     "AiCodingStack",
@@ -54,13 +54,7 @@
     "Roo",
     "shareAI",
     "TRAE",
-    "linkedin",
-    "gemini",
-    "aicodingstack",
-    "dedup",
-    "npmjs",
-    "Gitea",
-    "signup"
+    "linkedin"
   ],
   "allowCompoundWords": true
 }