feat: Store full Dutchie payload in latest_raw_payload

Now stores the complete raw product JSON from Dutchie on every
product refresh. This enables querying any Dutchie field
(terpenes, effects, description, etc.) without schema changes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/hydration/canonical-upsert.ts

@@ -92,7 +92,7 @@ export async function upsertStoreProducts(
             is_on_special, discount_percent,
             is_in_stock, stock_status, stock_quantity, total_quantity_available,
             thc_percent, cbd_percent,
-            image_url,
+            image_url, latest_raw_payload,
             first_seen_at, last_seen_at, updated_at
           ) VALUES (
             $1, $2, $3, $4,
@@ -101,7 +101,7 @@ export async function upsertStoreProducts(
             $13, $14,
             $15, $16, $17, $17,
             $18, $19,
-            $20,
+            $20, $21,
             NOW(), NOW(), NOW()
           )
           ON CONFLICT (dispensary_id, provider, provider_product_id)
@@ -123,6 +123,7 @@ export async function upsertStoreProducts(
             thc_percent = EXCLUDED.thc_percent,
             cbd_percent = EXCLUDED.cbd_percent,
             image_url = EXCLUDED.image_url,
+            latest_raw_payload = EXCLUDED.latest_raw_payload,
             last_seen_at = NOW(),
             updated_at = NOW()
           RETURNING id, (xmax = 0) as is_new, (local_image_path IS NOT NULL) as has_local_image`,
@@ -148,6 +149,7 @@ export async function upsertStoreProducts(
             product.thcPercent !== null && product.thcPercent <= 100 ? product.thcPercent : null,
             product.cbdPercent !== null && product.cbdPercent <= 100 ? product.cbdPercent : null,
             product.primaryImageUrl,
+            JSON.stringify(product.rawProduct),  // Full Dutchie payload
           ]
         );