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

plugins/slides/plugin.py

@@ -0,0 +1,74 @@
+"""Slides plugin main class.
+
+Display/service plugin: contributes a blueprint only (no model, no AssetType,
+no nav). Serves TV-dashboard slideshow images. Demonstrates the minimal plugin
+shape - a feature that is purely an API surface.
+"""
+
+import json
+import logging
+from pathlib import Path
+from typing import List, Dict, Optional, Type
+
+from flask import Flask, Blueprint
+
+from shopdb.plugins.base import BasePlugin, PluginMeta
+
+from .api import slides_bp
+from .models import TvSlide
+
+logger = logging.getLogger(__name__)
+
+
+class SlidesPlugin(BasePlugin):
+    """Slides plugin - TV dashboard slideshow images."""
+
+    def __init__(self):
+        self._manifest = self._load_manifest()
+
+    def _load_manifest(self) -> Dict:
+        """Load plugin manifest from JSON file."""
+        manifest_path = Path(__file__).parent / 'manifest.json'
+        if manifest_path.exists():
+            with open(manifest_path, 'r') as f:
+                return json.load(f)
+        return {}
+
+    @property
+    def meta(self) -> PluginMeta:
+        """Return plugin metadata."""
+        return PluginMeta(
+            name=self._manifest.get('name', 'slides'),
+            version=self._manifest.get('version', '1.0.0'),
+            description=self._manifest.get(
+                'description',
+                'TV dashboard slideshow images'
+            ),
+            author=self._manifest.get('author', 'ShopDB Team'),
+            dependencies=self._manifest.get('dependencies', []),
+            core_version=self._manifest.get('core_version', '>=0.1.0,<1.0.0'),
+            api_prefix=self._manifest.get('api_prefix', '/api/slides'),
+        )
+
+    def get_blueprint(self) -> Optional[Blueprint]:
+        """Return Flask Blueprint with API routes."""
+        return slides_bp
+
+    def get_models(self) -> List[Type]:
+        """Slide playlist metadata (image files live on disk)."""
+        return [TvSlide]
+
+    def get_navigation_items(self) -> List[Dict]:
+        """Sidebar entry for the slide manager (admin)."""
+        return [
+            {
+                'name': 'Slides',
+                'icon': 'image',
+                'route': '/settings/slides',
+                'position': 7,
+            },
+        ]
+
+    def init_app(self, app: Flask, db_instance) -> None:
+        """Initialize plugin with Flask app."""
+        logger.info(f"Slides plugin initialized (v{self.meta.version})")