Initial commit: adacam-api v1.0.0

Clean Python Flask replacement for odc-api (434k lines Node.js → ~350 lines Python)
- GET /api/1/landmarks/last/{N} - last N detections from SQLite
- POST /api/1/landmarks - ingest detections + forward to AdaMaps
- GET /api/1/gnssConcise/latestValid - GPS fix from Redis
- GET /api/1/status - device status
- GET /api/1/deviceinfo - device identity
- GET /api/1/recording/frames/latest - latest frame path

No /api/1/cmd - that's the CVE, it's gone.

Includes:
- SQLite for local storage + offline queue
- Background thread for AdaMaps retry
- systemd service unit
- install.sh for device deployment

adacam_api/routes/frames.py

@@ -0,0 +1,22 @@
+"""Recording frame endpoints."""
+import os
+import glob
+from flask import Blueprint, jsonify
+
+bp = Blueprint("frames", __name__, url_prefix="/api/1/recording")
+
+FRAMES_DIR = "/tmp/recording/pics"
+
+
+@bp.route("/frames/latest", methods=["GET"])
+def latest_frame():
+    """Get path to most recent frame file."""
+    if not os.path.isdir(FRAMES_DIR):
+        return jsonify({"error": "No frames directory"}), 404
+    
+    files = glob.glob(os.path.join(FRAMES_DIR, "*"))
+    if not files:
+        return jsonify({"error": "No frames available"}), 404
+    
+    latest = max(files, key=os.path.getmtime)
+    return jsonify({"path": latest})