feat(proxy): Implement reverse proxy with path transformation

Add reverse proxy functionality that routes requests based on host headers and transforms paths by removing configured prefixes. Includes comprehensive documentation and configuration files.

- Add reverse proxy with host-based routing
- Implement path transformation and URL rewriting
- Add YAML-based configuration for targets and endpoints
- Include PostgreSQL integration with GORM models
- Add comprehensive documentation and README
- Add Docker configuration for deployment

Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:alpine AS builder
+
+LABEL org.opencontainers.image.source=https://git.secnex.io/secnex/gogwapi
+
+WORKDIR /app
+
+COPY go.mod ./
+
+RUN go mod download && go mod verify
+
+COPY . .
+
+RUN go build -o gogwapi main.go
+
+FROM alpine:latest AS runner
+
+WORKDIR /app
+
+COPY --from=builder /app/gogwapi .
+
+EXPOSE 3000
+
+CMD ["./gogwapi"]