fix: Docker build and runtime fixes

- Fix duplicate 'signature' variable in webhooks.ts
- Add Prisma binary target for Alpine Linux
- Fix tsconfig path alias (@/* -> ./src/*)
- Add missing next-themes dependency
- Add build args for NEXT_PUBLIC_* env vars
- Fix SSR issues with zustand and providers
- Add providers-wrapper with dynamic ssr:false import
- Add SSL certs and public dir for nginx
- Update Dockerfiles for proper Prisma engine handling

backend/Dockerfile

@@ -36,9 +36,12 @@ RUN npm install --legacy-peer-deps --omit=dev
 
 # Copy built files from builder
 COPY --from=builder /app/backend/dist ./backend/dist
-COPY --from=builder /app/backend/node_modules/.prisma ./backend/node_modules/.prisma
+COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/backend/prisma ./backend/prisma
 
+# Ensure correct Prisma engine is available
+RUN ls -la /app/node_modules/.prisma/client/ | grep engine
+
 WORKDIR /app/backend
 
 # Expose port

backend/prisma/schema.prisma

@@ -1,5 +1,6 @@
 generator client {
-  provider = "prisma-client-js"
+  provider      = "prisma-client-js"
+  binaryTargets = ["linux-musl-openssl-3.0.x"]
 }
 
 datasource db {

backend/src/routes/webhooks.ts

@@ -26,11 +26,11 @@ function verifyWebhookSignature(payload: string, signature: string): boolean {
 // Tautulli webhook endpoint
 router.post('/tautulli',
   asyncHandler(async (req, res) => {
-    const signature = req.headers['x-tautulli-signature'] as string;
+    const webhookSignature = req.headers['x-tautulli-signature'] as string;
     const payload = JSON.stringify(req.body);
     
     // Verify signature if configured
-    if (WEBHOOK_SECRET && signature && !verifyWebhookSignature(payload, signature)) {
+    if (WEBHOOK_SECRET && webhookSignature && !verifyWebhookSignature(payload, webhookSignature)) {
       return res.status(401).json({ error: 'Invalid signature' });
     }