feat: implement robust multi-tier text input architecture and ADB diagnostics

- Android Text Input & IME Normalization:
  - Implement progressive 3-tier input architecture in AndroidAdbDriver and AndroidDeviceController:
    - Tier 1 (Primary): Zero-dependency clipboard injection + KEYCODE_PASTE (immune to IME Pinyin interception, full Unicode/Emoji support, preserves multiline formatting).
    - Tier 2 (Broadcast): Base64 broadcast injection when ADBKeyboard is active.
    - Tier 3 (Fallback): Native ADB physical keyevent fallback.
  - Add literal newline normalization (\r\n, \n, \r) to prevent JSON escape string corruption (e.g. '10086\n' -> '10086、n').
  - Add set_clipboard method to UIAutomatorClient without auxiliary APK requirements.

- Diagnostics & System Probes:
  - Add adb_keys diagnostics probe for ADB key auth checks.
  - Integrate diagnostics into CLI doctor command.

- Admin Console & Showcase UI:
  - Improve model service and system router in admin console.
  - Enhance workspace stream view and session state in showcase UI.

artemis/clients/ui_automator_client.py

@@ -341,6 +341,23 @@ class UIAutomatorClient:
             logger.error(f"UIAutomator2 clear_text failed: {e}")
             return False
 
+    def set_clipboard(self, text: str) -> bool:
+        """Set text to system clipboard via UIAutomator2.
+
+        Args:
+            text: The string to set in the device clipboard.
+
+        Returns:
+            True if successful, False otherwise.
+        """
+        try:
+            device = self._ensure_connected()
+            device.set_clipboard(text)
+            return True
+        except Exception as e:
+            logger.debug(f"UIAutomator2 set_clipboard failed: {e}")
+            return False
+
     def get_hierarchy(self) -> str:
         """Get the UI hierarchy XML from the device.