Remove nginx/webapp container; single Go server serves SPA + API

- Add root Dockerfile: node build → copy dist into Go embed path → distroless binary
- Update docker-compose: one service (api on :9050), DB renamed ralph→pamietnik
- Remove references to RALPH/reisejournal across all docs and configs

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

webapp/README.md

@@ -1,6 +1,6 @@
 # Pamietnik Webapp
 
-Eigenständige Single-Page-Application für das Pamietnik-Reisejournal. Kommuniziert über REST mit dem Go-Backend.
+Eigenständige Single-Page-Application für das Pamietnik. Kommuniziert über REST mit dem Go-Backend.
 
 ## Technologie
 

webapp/nginx.conf

@@ -2,6 +2,16 @@ server {
     listen 80;
 
     # API und Auth-Endpunkte zum Backend proxieren
+    location /healthz {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+    }
+
+    location /readyz {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+    }
+
     location /v1/ {
         proxy_pass http://api:8080;
         proxy_set_header Host $host;

webapp/src/api.ts

@@ -50,9 +50,15 @@ async function get<T>(path: string): Promise<T> {
 
 export const api = {
   getDays(from?: string, to?: string): Promise<DaySummary[]> {
-    const params = new URLSearchParams()
-    if (from) params.set('from', from)
-    if (to) params.set('to', to)
+    const now = new Date()
+    const defaultTo = now.toISOString().slice(0, 10)
+    const past = new Date(now)
+    past.setDate(past.getDate() - 90)
+    const defaultFrom = past.toISOString().slice(0, 10)
+    const params = new URLSearchParams({
+      from: from ?? defaultFrom,
+      to: to ?? defaultTo,
+    })
     return get<DaySummary[]>(`/v1/days?${params}`)
   },
   getTrackpoints(date: string): Promise<Trackpoint[]> {