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.

apps/showcase_ui/src/app/components/agent-stream/agent-stream.component.html

@@ -244,15 +244,15 @@
 
   <!-- Floating Top-Right Badges & Toolbar (Pinned overlay, hidden in empty/initial state) -->
   <div class="stream-floating-toolbar" *ngIf="consolidatedBlocks().length > 0 || showPlanningLoader()">
-    <!-- Active Model Info Chip (Informational Metadata, Not a Button) -->
+    <!-- Active Architecture Info Chip (Informational Metadata, Not a Button) -->
     <div 
       class="model-info-chip" 
       [ngClass]="getModelClass(model.name)"
       *ngIf="agentService.activeModel() as model"
-      [title]="'Active Model: ' + model.id + ' (' + model.provider + ')'"
+      [title]="getArchitectureTooltip(model)"
     >
       <span class="material-symbols-outlined model-icon">{{ getModelIcon(model.name) }}</span>
-      <span class="model-label">Model:</span>
+      <span class="model-label">Architecture:</span>
       <span class="model-name">{{ getModelDisplayName(model.name) }}</span>
     </div>