feat: add OEM code copy tracking, PostHog analytics, Postal email integration

- Add oem_code_copies table and analytics module for tracking part code copies
- Integrate PostHog for frontend product analytics (VIN decode, OEM copy events)
- Switch email service from stub to Postal API with proper error handling
- Add copy button to parts panel with clipboard + server-side logging
- Add admin copy-logs page with filtering and top-copied-codes view
- Add VIN report endpoint for users to flag unrecognized chassis numbers
- Add Postal email env vars to config schema

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

apps/web/src/hooks/use-schema-interaction.ts

@@ -16,12 +16,10 @@ export function useSchemaInteraction() {
   const lastTouchCenter = useRef<{ x: number; y: number } | null>(null);
 
   const onWheel = useCallback(
-    (e: React.WheelEvent) => {
-      if (e.ctrlKey || e.metaKey) {
-        e.preventDefault();
-        const delta = e.deltaY > 0 ? -0.1 : 0.1;
-        setZoom(zoom + delta);
-      }
+    (e: WheelEvent) => {
+      e.preventDefault();
+      const delta = e.deltaY > 0 ? -0.1 : 0.1;
+      setZoom(zoom + delta);
     },
     [zoom, setZoom],
   );