Multi-site distribution readiness: settings-driven site config, security closeout, release engineering, v0.5.0

Make the app distributable to other GE Aerospace sites (one self-hosted
instance per site, ADR-004). GE values remain the shipped defaults; every
site-specific behavior is now a Setting an admin can change in the UI.

Settings-driven site config:
- Branding: site/QR/badge logos, favicon, primary color (upload endpoints
  mirror the map-blueprint pattern; new Settings > Branding section).
- ServiceNow: search/incident/change URL templates ({ticket}), ticket
  prefixes, enable toggle. Defaults point at the current
  geaerospaceqa.service-now.com global search. Disabled = plain-text tickets.
- Employee-id regex (employeeid_pattern), printer hostname template,
  QR label targets (qr_target_printer / qr_target_usb, blank = asset page,
  else URL template with placeholders), usb_label_style (barcode|qr).
- West Jefferson floor-plan PNGs removed from the tree; generic placeholder
  ships as the map default and sites upload their own blueprint.

Security closeout:
- dashboarddefaults writes now require admin.
- Collector: generic error messages (no str(exc) leak); API key accepted
  via X-API-Key header only (BREAKING: querystring api_key removed).
- IP-based login rate limiting (AUTH_RATELIMIT_* knobs) atop account lockout.
- Setting.set() creation race fixed (IntegrityError retry).

Release engineering and docs:
- __version__ 0.5.0 (distinct from __contract_version__, ADR-007),
  CHANGELOG.md, Gitea Actions CI config, frontend version aligned.
- One wizard-first install story across README/DEPLOY; new CONFIG.md,
  UPGRADE.md, BACKUP-RESTORE.md; CLAUDE.md and ROADMAP de-staled.
- Dockerfile multi-stage build now bundles the frontend; compose binds
  MySQL to 127.0.0.1; stale database/schema.sql and one-off SQL removed.

Debt and fixes:
- .query.get() -> db.session.get() sweep; datetime.utcnow() removed
  (naive-UTC via timezone-aware now); users.py on authz decorators.
- Fixed 4 stale tests (slides feed shape, shopfloor splitperemployee,
  plugin contract purity) and the USB label page field mapping (both usb
  modes emit the cmmc shape: device_id/device_desc).
- Health endpoint reports the real version.

248 tests pass; naming/style check green; frontend builds; fresh-DB
flask db upgrade + seeds verified; QR targets verified by decoding
rendered codes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shopdb/core/api/customfields.py

@@ -68,7 +68,7 @@ def create_field():
     label = (data.get('label') or '').strip()
     if not assettypeid or not label:
         return error_response(ErrorCodes.VALIDATION_ERROR, 'assettypeid and label are required')
-    if not AssetType.query.get(assettypeid):
+    if not db.session.get(AssetType, assettypeid):
         return error_response(ErrorCodes.VALIDATION_ERROR, 'Unknown assettypeid')
 
     datatype = data.get('datatype') or 'text'
@@ -112,7 +112,7 @@ def create_field():
 @jwt_required()
 @require_role('admin')
 def update_field(fieldid):
-    field = CustomField.query.get(fieldid)
+    field = db.session.get(CustomField, fieldid)
     if not field:
         return error_response(ErrorCodes.NOT_FOUND, 'Custom field not found', http_code=404)
     data = request.get_json() or {}
@@ -137,7 +137,7 @@ def update_field(fieldid):
 @jwt_required()
 @require_role('admin')
 def delete_field(fieldid):
-    field = CustomField.query.get(fieldid)
+    field = db.session.get(CustomField, fieldid)
     if not field:
         return error_response(ErrorCodes.NOT_FOUND, 'Custom field not found', http_code=404)
     # Drop the field and any stored values for it.
@@ -172,7 +172,7 @@ def _fields_with_values(asset):
 @jwt_required(optional=True)
 def get_asset_fields(assetid):
     """Active custom fields for an asset's type, merged with its values."""
-    asset = Asset.query.get(assetid)
+    asset = db.session.get(Asset, assetid)
     if not asset:
         return error_response(ErrorCodes.NOT_FOUND, 'Asset not found', http_code=404)
     return success_response(_fields_with_values(asset))
@@ -183,7 +183,7 @@ def get_asset_fields(assetid):
 @require_role('admin')
 def save_asset_fields(assetid):
     """Upsert values for an asset. Body: {values: {fieldid: value, ...}}."""
-    asset = Asset.query.get(assetid)
+    asset = db.session.get(Asset, assetid)
     if not asset:
         return error_response(ErrorCodes.NOT_FOUND, 'Asset not found', http_code=404)
     data = request.get_json() or {}