feat(products): improve replenishment-aware shopping suggestions

Replace product weight and repurchase intent fields with per-package remaining levels and inventory-first restock signals. Enrich shopping suggestions with usage-aware replenishment scoring so the frontend and LLM can prioritize real gaps and near-empty staples more reliably.

frontend/messages/en.json

@@ -95,8 +95,11 @@
   "inventory_openedDate": "Opened date",
   "inventory_finishedDate": "Finished date",
   "inventory_expiryDate": "Expiry date",
-  "inventory_currentWeight": "Current weight (g)",
-  "inventory_lastWeighed": "Last weighed",
+  "inventory_remainingLevel": "Remaining product level",
+  "inventory_remainingHigh": "high",
+  "inventory_remainingMedium": "medium",
+  "inventory_remainingLow": "low",
+  "inventory_remainingNearlyEmpty": "nearly empty",
   "inventory_notes": "Notes",
   "inventory_badgeOpen": "Open",
   "inventory_badgeSealed": "Sealed",
@@ -104,8 +107,6 @@
   "inventory_exp": "Exp:",
   "inventory_opened": "Opened:",
   "inventory_finished": "Finished:",
-  "inventory_remaining": "g remaining",
-  "inventory_weighed": "Weighed:",
   "inventory_confirmDelete": "Delete this package?",
 
   "routines_title": "Routines",
@@ -514,7 +515,6 @@
   "productForm_isTool": "Is tool (e.g. dermaroller)",
   "productForm_needleLengthMm": "Needle length (mm, tools only)",
   "productForm_personalNotes": "Personal notes",
-  "productForm_repurchaseIntent": "Repurchase intent",
   "productForm_toleranceNotes": "Tolerance notes",
   "productForm_toleranceNotesPlaceholder": "e.g. Causes mild stinging, fine after 2 weeks",