Rename generate target to proto; dev data dir run/ -> srv/

Aligns with the platform engineering standards.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

ARCHITECTURE.md

@@ -1290,7 +1290,7 @@ The Makefile `docker` target automates the build step with the version tag.
 | `build` | Compile all binaries to `bin/` using current GOOS/GOARCH |
 | `test` | `go test -race ./...` |
 | `lint` | `golangci-lint run ./...` |
-| `generate` | `go generate ./...` (re-generates proto stubs) |
+| `proto` | `go generate ./...` (re-generates proto stubs) |
 | `man` | Build man pages; compress to `.gz` in `man/` |
 | `install` | Run `dist/install.sh` |
 | `docker` | `docker build -t mcias:$(VERSION) -t mcias:latest .` |