feat(drone): add Flask blueprint, register routes, wire drone_queue

Implements Task 5: creates routes/drone.py with /status, /contacts,
/start, /stop, and /stream (SSE fanout) endpoints; registers the
drone_bp blueprint in routes/__init__.py; adds drone_queue to app.py;
adds opendroneid>=1.0 to requirements.txt. All 39 drone tests pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_drone_routes.py

@@ -0,0 +1,63 @@
+import json
+import queue
+from unittest.mock import patch
+
+import pytest
+from flask import Flask
+
+import app as app_module
+from routes.drone import drone_bp
+
+
+@pytest.fixture(autouse=True)
+def mock_app_state(mocker):
+    mocker.patch.object(app_module, "drone_queue", queue.Queue())
+    yield
+
+
+@pytest.fixture
+def drone_app():
+    app = Flask(__name__)
+    app.register_blueprint(drone_bp)
+    app.config["TESTING"] = True
+    return app
+
+
+@pytest.fixture
+def client(drone_app):
+    return drone_app.test_client()
+
+
+def test_status_returns_json(client):
+    resp = client.get("/drone/status")
+    assert resp.status_code == 200
+    data = json.loads(resp.data)
+    assert "running" in data
+    assert "vectors" in data
+
+
+def test_contacts_returns_empty_list_when_idle(client):
+    resp = client.get("/drone/contacts")
+    assert resp.status_code == 200
+    data = json.loads(resp.data)
+    assert data == [] or isinstance(data, list)
+
+
+def test_start_returns_ok(client):
+    with (
+        patch("routes.drone._correlator"),
+        patch("routes.drone._remote_id_scanner"),
+        patch("routes.drone._rf_detector"),
+    ):
+        resp = client.post("/drone/start", json={})
+        assert resp.status_code == 200
+
+
+def test_stop_returns_ok(client):
+    resp = client.post("/drone/stop")
+    assert resp.status_code == 200
+
+
+def test_stream_returns_event_stream(client):
+    resp = client.get("/drone/stream")
+    assert resp.content_type.startswith("text/event-stream")