feat(settings): persist storage provider settings to DB, add export endpoint, enrich setup wizard

- dropbox/google_drive/onedrive save-settings: switch to DB as primary,
  .env write as best-effort (no longer fails when .env is absent)
- onedrive/google_drive update-settings: persist changes to DB alongside
  in-memory update; call notify_settings_updated()
- onedrive test_onedrive_token: persist rotated refresh token to DB
- settings_service: add get_settings_for_export() (db / effective modes)
- settings API: add GET /api/settings/export-env (admin-only, downloads .env)
- wizard: enrich settings with current values (DB > ENV > default) and
  value_source badges; pass setup_skipped to template; call
  notify_settings_updated() on save; add /setup/undo-skip route
- setup_wizard.html: pre-populate inputs with current_value; show
  DB/ENV/DEFAULT source badges; skip/undo-skip messaging
- settings.html: replace single Audit Log button with Setup Wizard link,
  Export .env dropdown, and Audit Log button group

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app/views/wizard.py

@@ -10,6 +10,7 @@ from fastapi.responses import RedirectResponse
 from sqlalchemy.orm import Session
 
 from app.utils.settings_service import save_setting_to_db
+from app.utils.settings_sync import notify_settings_updated
 from app.utils.setup_wizard import get_wizard_steps
 from app.views.base import APIRouter, get_db, templates
 
@@ -18,7 +19,7 @@ router = APIRouter()
 
 
 @router.get("/setup")
-async def setup_wizard(request: Request, step: int = 1):
+async def setup_wizard(request: Request, step: int = 1, db: Session = Depends(get_db)):
     """
     Setup wizard for first-time configuration.
 
@@ -39,7 +40,38 @@ async def setup_wizard(request: Request, step: int = 1):
     current_settings = wizard_steps.get(step, [])
 
     # Get step category (all settings in a step should have same category)
-    step_category = current_settings[0].get("wizard_category", "Configuration") if current_settings else "Configuration"
+    step_category = (
+        current_settings[0].get("wizard_category", "Configuration")
+        if current_settings
+        else "Configuration"
+    )
+
+    # Enrich settings with current live values
+    from app.config import settings as app_settings
+    from app.utils.settings_service import get_setting_from_db
+
+    enriched_settings = []
+    for s in current_settings:
+        key = s["key"]
+        db_val = get_setting_from_db(db, key)
+        env_val = getattr(app_settings, key, None)
+        # Determine current_value and source
+        if db_val is not None:
+            current_value = db_val
+            value_source = "db"
+        elif env_val is not None and str(env_val).strip():
+            current_value = str(env_val)
+            value_source = "env"
+        elif s.get("default") is not None:
+            current_value = s["default"]
+            value_source = "default"
+        else:
+            current_value = ""
+            value_source = "none"
+        enriched_settings.append(
+            {**s, "current_value": current_value, "value_source": value_source}
+        )
+    current_settings = enriched_settings
 
     return templates.TemplateResponse(
         "setup_wizard.html",
@@ -50,12 +82,15 @@ async def setup_wizard(request: Request, step: int = 1):
             "settings": current_settings,
             "step_category": step_category,
             "progress_percent": int((step / max_step) * 100),
+            "setup_skipped": bool(get_setting_from_db(db, "_setup_wizard_skipped")),
         },
     )
 
 
 @router.post("/setup")
-async def setup_wizard_save(request: Request, step: int = Form(...), db: Session = Depends(get_db)):
+async def setup_wizard_save(
+    request: Request, step: int = Form(...), db: Session = Depends(get_db)
+):
     """
     Save settings from the current wizard step.
     """
@@ -87,6 +122,9 @@ async def setup_wizard_save(request: Request, step: int = Form(...), db: Session
 
         logger.info(f"Setup wizard step {step}: Saved {saved_count} settings")
 
+        if saved_count > 0:
+            notify_settings_updated()
+
         # Determine next step
         max_step = max(wizard_steps.keys())
         next_step = step + 1
@@ -100,7 +138,9 @@ async def setup_wizard_save(request: Request, step: int = Form(...), db: Session
 
     except Exception as e:
         logger.error(f"Error saving wizard settings: {e}")
-        return RedirectResponse(url=f"/setup?step={step}&error=save_failed", status_code=303)
+        return RedirectResponse(
+            url=f"/setup?step={step}&error=save_failed", status_code=303
+        )
 
 
 @router.get("/setup/skip")
@@ -122,3 +162,25 @@ async def setup_wizard_skip(request: Request):
     except Exception as e:
         logger.error(f"Error skipping setup wizard: {e}")
         return RedirectResponse(url="/", status_code=303)
+
+
+@router.get("/setup/undo-skip")
+async def setup_wizard_undo_skip(request: Request, db: Session = Depends(get_db)):
+    """
+    Undo a previously skipped setup wizard.
+
+    Removes the skip marker from the database so the wizard will be
+    presented again on next visit to the home page.  Redirects to
+    step 1 of the wizard immediately.
+    """
+    try:
+        from app.utils.settings_service import delete_setting_from_db
+
+        delete_setting_from_db(
+            db, "_setup_wizard_skipped", changed_by="wizard_undo_skip"
+        )
+        logger.info("Setup wizard skip marker removed; redirecting to wizard")
+        return RedirectResponse(url="/setup?step=1", status_code=303)
+    except Exception as e:
+        logger.error(f"Error undoing setup wizard skip: {e}")
+        return RedirectResponse(url="/settings", status_code=303)