Fix frontend unable to load weather data by using relative API URL

NEXT_PUBLIC_API_URL was only set at runtime via k8s ConfigMap, but Next.js
inlines NEXT_PUBLIC_* vars at build time. The fallback localhost:8080 URL was
baked into the JS bundle, causing all browser requests to fail. Changed default
to relative /api/v1 which routes correctly through the Ingress. Also updates
Dockerfile ENV syntax and k8s frontend port to 8080.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

k8s.yaml

@@ -4,6 +4,30 @@ kind: Namespace
 metadata:
   name: paragliding
 
+---
+# External PostgreSQL Service (points to host database)
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres-service
+  namespace: paragliding
+spec:
+  ports:
+    - port: 5432
+      targetPort: 5432
+
+---
+apiVersion: v1
+kind: Endpoints
+metadata:
+  name: postgres-service
+  namespace: paragliding
+subsets:
+  - addresses:
+      - ip: 192.168.1.93
+    ports:
+      - port: 5432
+
 ---
 apiVersion: v1
 kind: ConfigMap
@@ -106,7 +130,7 @@ spec:
           image: harbor.scottyah.com/scottyah/paragliding-web:latest
           imagePullPolicy: Always
           ports:
-            - containerPort: 3000
+            - containerPort: 8080
           envFrom:
             - configMapRef:
                 name: paragliding-config
@@ -120,13 +144,13 @@ spec:
           livenessProbe:
             httpGet:
               path: /
-              port: 3000
+              port: 8080
             initialDelaySeconds: 10
             periodSeconds: 30
           readinessProbe:
             httpGet:
               path: /
-              port: 3000
+              port: 8080
             initialDelaySeconds: 5
             periodSeconds: 10
       imagePullSecrets:
@@ -140,8 +164,8 @@ metadata:
   namespace: paragliding
 spec:
   ports:
-    - port: 3000
-      targetPort: 3000
+    - port: 8080
+      targetPort: 8080
       protocol: TCP
   selector:
     app: paragliding-web
@@ -179,4 +203,4 @@ spec:
               service:
                 name: paragliding-web-svc
                 port:
-                  number: 3000
+                  number: 8080