feat(console): add Artemis Admin & Trace Console backend and management plane

Introduces the comprehensive developer/administrator control plane and trace
inspection console backend for the ARTEMIS mobile automation platform.

Key Features & Backend Architecture:
- Core Server & Modular Routing:
  * FastAPI modular architecture with dedicated routers for sessions, steps, tasks, media, stream, and replay.
  * Multi-layer repository pattern with SQLite persistence for sessions, traces, and step data.
- Task Control & Queue Management:
  * FIFO asynchronous task queue service with support for single/batch goal execution and profile selection (Flash / Pro).
  * Session lifecycle controls (run, pause, resume, stop, clear queue).
  * Startup orphan cleanup and automatic older replay archiving.
- Live Telemetry & IPC Communication:
  * High-performance IPC server for streaming real-time execution logs, agent thoughts, and tool invocations.
  * Server-Sent Events (SSE) /api/stream/{session_id} endpoint for live UI updates.
- Real-Time Device Streaming:
  * Live ADB screen capture and MJPEG frame generator (/api/stream/device-live).
  * Device connectivity and state inspection endpoint (/api/stream/device-state).
- Trace Inspection & Step Replay Engine:
  * Hierarchical call tree inspection, pre/post step screenshots, and action overlay metadata.
  * Isolated single-step replay manager (/api/replay) for interactive debugging and validation.

apps/admin_console/database/connection.py

@@ -0,0 +1,43 @@
+# 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.
+
+from contextlib import contextmanager
+from pathlib import Path
+import sqlite3
+from fastapi import HTTPException
+
+try:
+    from admin_console.core.config import DB_PATH
+except ImportError:
+    from apps.admin_console.core.config import DB_PATH
+
+
+def get_db(db_path: Path | None = None) -> sqlite3.Connection:
+    """Returns a SQLite connection with timeout and Row row_factory."""
+    path = db_path or DB_PATH
+    if not path.exists():
+        raise HTTPException(status_code=500, detail=f"Database not found at {path}")
+    conn = sqlite3.connect(path, timeout=10.0)
+    conn.row_factory = sqlite3.Row
+    return conn
+
+
+@contextmanager
+def db_session(db_path: Path | None = None):
+    """Context manager for SQLite connections ensuring clean closure."""
+    conn = get_db(db_path)
+    try:
+        yield conn
+    finally:
+        conn.close()