feat: repair-POS integration, receipt formats, manager overrides, price adjustments

- Add thermal/full-page receipt format toggle (per-device, localStorage)
- Full-page receipt uses clean invoice layout matching repair PDF style
- Settings page reorganized into tabbed sections (Store, Locations, Modules, Receipt, POS Security, Advanced)
- Manager override system: configurable PIN prompt for void, refund, discount, cash in/out
- Discount threshold setting: require manager approval above X%
- Consumable product type: tracked for internal job costing, excluded from POS search, receipts, and customer-facing totals
- Repair line item dialog: product picker dropdown for parts/consumables from inventory
- Repair → POS checkout: load ready-for-pickup tickets into repair_payment transactions with proper tax categories (labor=service, parts=goods)
- Transaction completion auto-updates repair ticket status to picked_up
- POS Repairs dialog with Pickup and New Intake tabs, customer account lookup
- Inline price adjustment on cart items: % off, $ off, or set price with live preview
- Order-level discount button with same three input modes
- Backend: migration 0043 (consumable enum + is_consumable flag), createFromRepairTicket service, ready-for-pickup endpoint
- Fix: backend dev script uses --env-file for turbo compatibility

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/backend/src/db/migrations/0043_repair-pos-consumable.sql

@@ -0,0 +1,5 @@
+-- Add 'consumable' to repair_line_item_type enum
+ALTER TYPE repair_line_item_type ADD VALUE IF NOT EXISTS 'consumable';
+
+-- Add is_consumable flag to product table
+ALTER TABLE product ADD COLUMN IF NOT EXISTS is_consumable boolean NOT NULL DEFAULT false;

packages/backend/src/db/migrations/meta/_journal.json

@@ -309,6 +309,13 @@
       "when": 1775590000000,
       "tag": "0042_user-pin",
       "breakpoints": true
+    },
+    {
+      "idx": 43,
+      "version": "7",
+      "when": 1775680000000,
+      "tag": "0043_repair-pos-consumable",
+      "breakpoints": true
     }
   ]
 }