style: cyan banner for oasyce-agent CLI

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Shangri-la-0428

oasyce_sdk/agent/cli.py

@@ -23,12 +23,21 @@
 
 
 def _print_banner():
-    print("""
-  ___   __ _ ___ _   _  ___ ___
- / _ \\ / _` / __| | | |/ __/ _ \\
-| (_) | (_| \\__ \\ |_| | (_|  __/
- \\___/ \\__,_|___/\\__, |\\___\\___|  agent
-                 |___/
+    # Cyan/teal ANSI: \033[36m = cyan, \033[96m = bright cyan, \033[0m = reset
+    C = "\033[36m"   # cyan
+    B = "\033[96m"   # bright cyan
+    D = "\033[90m"   # dim gray
+    R = "\033[0m"    # reset
+    print(f"""
+{B}  ╔═══════════════════════════════════════╗
+{B}  ║{C}   ___   __ _ ___ _   _  ___ ___       {B}║
+{B}  ║{C}  / _ \\ / _` / __| | | |/ __/ _ \\      {B}║
+{B}  ║{C} | (_) | (_| \\__ \\ |_| | (_|  __/      {B}║
+{B}  ║{C}  \\___/ \\__,_|___/\\__, |\\___\\___|      {B}║
+{B}  ║{C}                  |___/                 {B}║
+{B}  ║                                       ║
+{B}  ║  {D}a g e n t{R}{B}          {D}v0.8.3{R}{B}            ║
+{B}  ╚═══════════════════════════════════════╝{R}
 """)