ci: add vet and test steps, fix build targets to src directory

- Add go vet and go test steps to CI workflow
- Update Dockerfile and CI build commands to target ./src
- Comment out build jobs for Linux and Windows
- Fix build paths across the workflow configuration

Dockerfile

@@ -13,7 +13,7 @@ RUN /usr/local/go/bin/go env -w GOPROXY=https://go.iranserver.com/repository/go/
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o auth-proxy .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o auth-proxy ./src
 
 # Runtime stage
 FROM docker.iranserver.com/alpine:3.23