feat: add manual SD card data upload for offline NRLs; rename RecordingSession to MonitoringSession

- Add POST /api/projects/{project_id}/nrl/{location_id}/upload-data endpoint
  accepting a ZIP or multi-file select of .rnd/.rnh files from an SD card.
  Parses .rnh metadata for session start/stop times, serial number, and store
  name. Creates a MonitoringSession (no unit assignment required) and DataFile
  records for each measurement file.

- Add Upload Data button and collapsible upload panel to the NRL detail Data
  Files tab, with inline success/error feedback and automatic file list refresh
  via HTMX after import.

- Rename RecordingSession -> MonitoringSession throughout the codebase
  (models.py, projects.py, project_locations.py, scheduler.py, roster_rename.py,
  main.py, init_projects_db.py, scripts/rename_unit.py). DB table renamed from
  recording_sessions to monitoring_sessions; old indexes dropped and recreated.

- Update all template UI copy from Recording Sessions to Monitoring Sessions
  (nrl_detail, projects/detail, session_list, schedule_oneoff, roster).

- Add backend/migrate_rename_recording_to_monitoring_sessions.py for applying
  the table rename on production databases before deploying this build.

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

backend/services/scheduler.py

@@ -21,7 +21,7 @@ from sqlalchemy.orm import Session
 from sqlalchemy import and_
 
 from backend.database import SessionLocal
-from backend.models import ScheduledAction, RecordingSession, MonitoringLocation, Project, RecurringSchedule
+from backend.models import ScheduledAction, MonitoringSession, MonitoringLocation, Project, RecurringSchedule
 from backend.services.device_controller import get_device_controller, DeviceControllerError
 from backend.services.alert_service import get_alert_service
 import uuid
@@ -272,7 +272,7 @@ class SchedulerService:
         )
 
         # Create recording session
-        session = RecordingSession(
+        session = MonitoringSession(
             id=str(uuid.uuid4()),
             project_id=action.project_id,
             location_id=action.location_id,
@@ -336,11 +336,11 @@ class SchedulerService:
         )
 
         # Find and update the active recording session
-        active_session = db.query(RecordingSession).filter(
+        active_session = db.query(MonitoringSession).filter(
             and_(
-                RecordingSession.location_id == action.location_id,
-                RecordingSession.unit_id == unit_id,
-                RecordingSession.status == "recording",
+                MonitoringSession.location_id == action.location_id,
+                MonitoringSession.unit_id == unit_id,
+                MonitoringSession.status == "recording",
             )
         ).first()
 
@@ -617,11 +617,11 @@ class SchedulerService:
                 result["steps"]["download"] = {"success": False, "error": "Project or location not found"}
 
             # Close out the old recording session
-            active_session = db.query(RecordingSession).filter(
+            active_session = db.query(MonitoringSession).filter(
                 and_(
-                    RecordingSession.location_id == action.location_id,
-                    RecordingSession.unit_id == unit_id,
-                    RecordingSession.status == "recording",
+                    MonitoringSession.location_id == action.location_id,
+                    MonitoringSession.unit_id == unit_id,
+                    MonitoringSession.status == "recording",
                 )
             ).first()
 
@@ -648,7 +648,7 @@ class SchedulerService:
                 result["steps"]["start"] = {"success": True, "response": cycle_response}
 
                 # Create new recording session
-                new_session = RecordingSession(
+                new_session = MonitoringSession(
                     id=str(uuid.uuid4()),
                     project_id=action.project_id,
                     location_id=action.location_id,