Switch local API port to 8122 and keep DB internal.

Update runtime defaults, compose mappings, frontend defaults, and developer docs to use port 8122 while keeping PostGIS reachable only via the internal compose network.

Made-with: Cursor

Dockerfile

@@ -23,8 +23,8 @@ RUN --mount=type=cache,target=/go/pkg/mod \
     go build -p "$(nproc)" -trimpath -ldflags="-s -w" -o /out/api ./cmd/api
 
 FROM base AS dev
-ENV ADDR=:8080
-EXPOSE 8080
+ENV ADDR=:8122
+EXPOSE 8122
 CMD ["go", "run", "./cmd/api"]
 
 FROM gcr.io/distroless/static-debian12:nonroot AS runtime
@@ -32,7 +32,7 @@ FROM gcr.io/distroless/static-debian12:nonroot AS runtime
 WORKDIR /app
 COPY --from=builder /out/api /app/api
 
-ENV ADDR=:8080
-EXPOSE 8080
+ENV ADDR=:8122
+EXPOSE 8122
 
 ENTRYPOINT ["/app/api"]