docs(guide): rewrite CLAUDE.md with ZCLAW-first perspective

Major changes:
- Shift from "OpenFang desktop client" to "independent AI Agent desktop app"
- Add decision principle: "Is this useful for ZCLAW? Does it affect ZCLAW?"
- Simplify project structure and tech stack sections
- Replace OpenClaw vs OpenFang comparison with unified backend approach
- Consolidate troubleshooting from scattered sections into organized FAQ
- Update Hands system documentation with 8 capabilities and status
- Stream

desktop/src/index.css

@@ -1,10 +1,14 @@
 @import "tailwindcss";
 
 :root {
-  /* Brand Colors */
-  --color-primary: #f97316;
-  --color-primary-hover: #ea580c;
-  --color-primary-light: #fff7ed;
+  /* Brand Colors - 中性灰色系 */
+  --color-primary: #374151;           /* gray-700 */
+  --color-primary-hover: #1f2937;     /* gray-800 */
+  --color-primary-light: #f3f4f6;     /* gray-100 */
+
+  /* Accent Color - 仅用于重要强调 */
+  --color-accent: #f97316;            /* orange-500 */
+  --color-accent-hover: #ea580c;      /* orange-600 */
 
   /* Semantic Colors */
   --color-success: #22c55e;
@@ -77,7 +81,7 @@ body {
 }
 
 .agent-avatar {
-  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
+  background: #4b5563;  /* gray-600 */
 }
 
 .chat-bubble-assistant {
@@ -88,7 +92,7 @@ body {
 }
 
 .chat-bubble-user {
-  background: #f97316;
+  background: #374151;  /* gray-700 */
   color: white;
   border-radius: 12px;
   border-bottom-right-radius: 4px;