feat: funcs as global Go service (sless-funcs-service:v0.1.1)

- services/funcs/main.go: standalone Go HTTP server
  extracts JWT sub -> SHA256[:8] -> namespace -> calls operator API
  returns plain text list, sorted active first, /health probe endpoint
- services/funcs/Dockerfile: multi-stage Go build -> alpine
- deployments/k8s/funcs-service.yaml: Deployment+Service+Ingress in sless ns
  ingress path /funcs -> sless-funcs-service:8090, reuses sless-operator-tls
- examples/POSTGRES/resources.tf: removed funcs_list function+trigger+output

Image: naeel/sless-funcs-service:v0.1.1

services/funcs/Dockerfile

@@ -0,0 +1,15 @@
+# 2026-03-18
+# Dockerfile для sless-funcs-service.
+# Многоэтапная сборка: Go → alpine (минимальный образ).
+# Сервис не нуждается во внешних зависимостях — только stdlib.
+
+FROM golang:1.23-alpine AS builder
+WORKDIR /build
+COPY go.mod main.go ./
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o funcs-service .
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates
+COPY --from=builder /build/funcs-service /funcs-service
+EXPOSE 8090
+ENTRYPOINT ["/funcs-service"]