feat: enable Fischerei, Sitzungsprotokolle, Verbandsverwaltung modules

- Enable all 3 modules via NEXT_PUBLIC_ENABLE_* build args + runtime env
- Fix empty-string-to-null for date/optional columns in all module APIs:
  fischerei (24 fixes), verbandsverwaltung (15 fixes), sitzungsprotokolle (2 fixes)
- CACHE_BUST=12 for full rebuild with new feature flags

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 # --- Install + Build in one stage ---
 FROM base AS builder
 # CACHE_BUST: change this value to force a full rebuild (busts Docker layer cache)
-ARG CACHE_BUST=11
+ARG CACHE_BUST=12
 RUN echo "Cache bust: ${CACHE_BUST}"
 COPY . .
 RUN pnpm install --no-frozen-lockfile
@@ -17,10 +17,16 @@ ARG NEXT_PUBLIC_SITE_URL=https://myeasycms.de
 ARG NEXT_PUBLIC_SUPABASE_URL=http://localhost:8000
 ARG NEXT_PUBLIC_SUPABASE_PUBLIC_KEY
 ARG NEXT_PUBLIC_DEFAULT_LOCALE=de
+ARG NEXT_PUBLIC_ENABLE_FISCHEREI=true
+ARG NEXT_PUBLIC_ENABLE_MEETING_PROTOCOLS=true
+ARG NEXT_PUBLIC_ENABLE_VERBANDSVERWALTUNG=true
 ENV NEXT_PUBLIC_SITE_URL=${NEXT_PUBLIC_SITE_URL}
 ENV NEXT_PUBLIC_SUPABASE_URL=${NEXT_PUBLIC_SUPABASE_URL}
 ENV NEXT_PUBLIC_SUPABASE_PUBLIC_KEY=${NEXT_PUBLIC_SUPABASE_PUBLIC_KEY}
 ENV NEXT_PUBLIC_DEFAULT_LOCALE=${NEXT_PUBLIC_DEFAULT_LOCALE}
+ENV NEXT_PUBLIC_ENABLE_FISCHEREI=${NEXT_PUBLIC_ENABLE_FISCHEREI}
+ENV NEXT_PUBLIC_ENABLE_MEETING_PROTOCOLS=${NEXT_PUBLIC_ENABLE_MEETING_PROTOCOLS}
+ENV NEXT_PUBLIC_ENABLE_VERBANDSVERWALTUNG=${NEXT_PUBLIC_ENABLE_VERBANDSVERWALTUNG}
 RUN pnpm --filter web build
 
 # --- Run ---