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.

tests/unit/admin_console/test_model_service.py

@@ -0,0 +1,53 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+from unittest.mock import patch, MagicMock
+
+import pytest
+
+from apps.admin_console.services.model_service import ModelService
+
+
+def test_get_active_model_info_pro_architecture():
+    """Verify that pro profile returns Pro architecture while keeping real LLM model."""
+    info = ModelService.get_active_model_info("pro")
+    assert info["name"] == "Pro"
+    assert info["architecture"] == "ARTEMIS Pro"
+    assert info["provider"] == "google"
+    assert "id" in info
+
+
+def test_get_active_model_info_flash_architecture():
+    """Verify that flash profile returns Flash architecture."""
+    info = ModelService.get_active_model_info("flash")
+    assert info["name"] == "Flash"
+    assert info["architecture"] == "ARTEMIS Flash"
+    assert info["provider"] == "google"
+
+
+def test_resolve_session_profile_from_device_info():
+    """Verify profile resolution from device_info JSON."""
+    row = {"device_info": json.dumps({"profile": "pro"})}
+    assert ModelService.resolve_session_profile(row) == "pro"
+
+    row_flash = {"device_info": json.dumps({"profile": "flash"})}
+    assert ModelService.resolve_session_profile(row_flash) == "flash"
+
+
+def test_resolve_session_profile_from_agent_names():
+    """Verify profile resolution from agent/trace names."""
+    row = {"device_info": None}
+    assert ModelService.resolve_session_profile(row, agent_names=["planner", "operator"]) == "pro"
+    assert ModelService.resolve_session_profile(row, agent_names=["flashrunner"]) == "flash"