Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

wsgi.py

@@ -0,0 +1,45 @@
+"""WSGI entry point for the application."""
+
+import os
+from dotenv import load_dotenv
+
+# Load environment variables from .env file
+load_dotenv()
+
+from shopdb import create_app
+
+app = create_app(os.environ.get('FLASK_ENV', 'development'))
+
+
+class MountPathMiddleware:
+    """Serve the whole app (API + SPA) under a URL prefix, e.g. '/ops'.
+
+    Used when the app is deployed as an IIS Application under an existing
+    site instead of its own site: IIS forwards the full request path
+    ('/ops/api/...'), so the prefix is moved from PATH_INFO to SCRIPT_NAME
+    before Flask routes it. Flask then also generates URLs under the prefix.
+    The frontend must be built with the matching VITE_BASE_PATH ('/ops/').
+    """
+
+    def __init__(self, wsgi_app, mountpath):
+        self.wsgi_app = wsgi_app
+        self.mountpath = '/' + mountpath.strip('/')
+
+    def __call__(self, environ, start_response):
+        path = environ.get('PATH_INFO', '')
+        if path == self.mountpath or path.startswith(self.mountpath + '/'):
+            environ['SCRIPT_NAME'] = environ.get('SCRIPT_NAME', '') + self.mountpath
+            environ['PATH_INFO'] = path[len(self.mountpath):] or '/'
+            return self.wsgi_app(environ, start_response)
+        start_response('404 Not Found', [('Content-Type', 'text/plain')])
+        return [b'Not Found: the app is mounted at ' + self.mountpath.encode() + b'/']
+
+
+# MOUNT_PATH (.env or web.config) activates the subpath deployment method.
+# Unset/empty = the app owns the server root (its own IIS site; the default).
+_mountpath = os.environ.get('MOUNT_PATH', '').strip()
+if _mountpath and _mountpath != '/':
+    app.wsgi_app = MountPathMiddleware(app.wsgi_app, _mountpath)
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5001, debug=True)