feat: major dependency upgrades, remove Redis, fix mongoose 9 types

Dependencies upgraded:
- svelte 5.38→5.55, @sveltejs/kit 2.37→2.56, adapter-node 5.3→5.5
- mongoose 8→9, sharp 0.33→0.34, typescript 5→6
- lucide-svelte → @lucide/svelte 1.7 (Svelte 5 native package)
- vite 7→8 with rolldown (build time 33s→14s)
- Removed terser (esbuild/oxc default minifier is 20-100x faster)

Infrastructure:
- Removed Redis/ioredis cache layer — MongoDB handles caching natively
- Deleted src/lib/server/cache.ts and all cache.get/set/invalidate usage
- Removed redis-cli from deploy workflow, Redis env vars from .env.example

Mongoose 9 migration:
- Replaced deprecated `new: true` with `returnDocument: 'after'` (16 files)
- Fixed strict query filter types for ObjectId/paymentId fields
- Fixed season param type (string→number) in recipe API
- Removed unused @ts-expect-error in WorkoutSession model

package.json

@@ -25,43 +25,41 @@
 	"packageManager": "pnpm@9.0.0",
 	"devDependencies": {
 		"@playwright/test": "1.56.1",
-		"@sveltejs/adapter-auto": "^6.1.0",
-		"@sveltejs/kit": "^2.37.0",
-		"@sveltejs/vite-plugin-svelte": "^6.1.3",
+		"@sveltejs/adapter-auto": "^7.0.1",
+		"@sveltejs/kit": "^2.56.1",
+		"@sveltejs/vite-plugin-svelte": "^7.0.0",
 		"@tauri-apps/cli": "^2.10.1",
 		"@testing-library/jest-dom": "^6.9.1",
-		"@testing-library/svelte": "^5.2.9",
+		"@testing-library/svelte": "^5.3.1",
 		"@types/leaflet": "^1.9.21",
 		"@types/node": "^22.12.0",
 		"@types/node-cron": "^3.0.11",
-		"@vitest/ui": "^4.0.10",
+		"@vitest/ui": "^4.1.2",
 		"jsdom": "^27.2.0",
-		"svelte": "^5.38.6",
-		"svelte-check": "^4.0.0",
-		"terser": "^5.46.0",
-		"tslib": "^2.6.0",
-		"typescript": "^5.1.6",
-		"vite": "^7.1.3",
-		"vite-node": "^5.3.0",
-		"vitest": "^4.0.10"
+		"svelte": "^5.55.1",
+		"svelte-check": "^4.4.6",
+		"tslib": "^2.8.1",
+		"typescript": "^6.0.2",
+		"vite": "^8.0.4",
+		"vite-node": "^6.0.0",
+		"vitest": "^4.1.2"
 	},
 	"dependencies": {
 		"@auth/sveltekit": "^1.11.1",
-		"@huggingface/transformers": "^4.0.0",
+		"@huggingface/transformers": "^4.0.1",
+		"@lucide/svelte": "^1.7.0",
 		"@nicolo-ribaudo/chokidar-2": "2.1.8-no-fsevents.3",
-		"@sveltejs/adapter-node": "^5.0.0",
+		"@sveltejs/adapter-node": "^5.5.4",
 		"@tauri-apps/plugin-geolocation": "^2.3.2",
 		"barcode-detector": "^3.1.2",
-		"chart.js": "^4.5.0",
+		"chart.js": "^4.5.1",
 		"chartjs-adapter-date-fns": "^3.0.0",
 		"date-fns": "^4.1.0",
 		"file-type": "^19.0.0",
-		"ioredis": "^5.9.0",
 		"leaflet": "^1.9.4",
-		"lucide-svelte": "^0.575.0",
-		"mongoose": "^8.0.0",
+		"mongoose": "^9.4.1",
 		"node-cron": "^4.2.1",
-		"sharp": "^0.33.0"
+		"sharp": "^0.34.5"
 	},
 	"pnpm": {
 		"onlyBuiltDependencies": [