feat: Stock Correction Modal (#47)

* feat: add stock correction modal with blister-based input

- Add 'Correct Stock' button to medication detail modal
- New modal with Full Blisters + Partial Blister Pills inputs
- Auto-conversion for edge cases (full/negative partial)
- New stockAdjustment field for DB corrections without touching looseTablets
- New lastStockCorrectionAt timestamp to ignore old consumed doses after correction
- Tracking data preserved for future statistics
- Add Drizzle migrations for new columns
- Add translations for en/de

* fix: add stock_adjustment columns to e2e/integration test schemas

backend/src/test/e2e-routes.test.ts

@@ -85,6 +85,8 @@ async function createSchema(client: Client) {
       blisters_per_pack integer NOT NULL DEFAULT 1,
       pills_per_blister integer NOT NULL DEFAULT 1,
       loose_tablets integer NOT NULL DEFAULT 0,
+      stock_adjustment integer NOT NULL DEFAULT 0,
+      last_stock_correction_at integer,
       pill_weight_mg integer,
       usage_json text NOT NULL DEFAULT '[]',
       every_json text NOT NULL DEFAULT '[]',

backend/src/test/integration.test.ts

@@ -80,6 +80,8 @@ async function createSchema(client: Client) {
       blisters_per_pack integer NOT NULL DEFAULT 1,
       pills_per_blister integer NOT NULL DEFAULT 1,
       loose_tablets integer NOT NULL DEFAULT 0,
+      stock_adjustment integer NOT NULL DEFAULT 0,
+      last_stock_correction_at integer,
       pill_weight_mg integer,
       usage_json text NOT NULL DEFAULT '[]',
       every_json text NOT NULL DEFAULT '[]',