Remove Go implementation, promote TypeScript app as canonical

The TypeScript/OOP rewrite has reached full functional parity and is
now the only implementation:

- Delete cmd/, internal/, go.mod, go.sum.
- Promote Dockerfile.node -> Dockerfile and docker-compose.node.yml ->
  docker-compose.yml (service renamed sugarr-node -> sugarr).
- Update README and .gitignore to drop the "two implementations"
  framing and Go-specific entries.

Verified after the rename: tsc --noEmit clean, full test suite
passing (75/75), docker compose build succeeds.

.gitignore

@@ -1,39 +1,5 @@
-# ---> Go
-# Compiled Object files, Static and Dynamic libs (Shared Objects)
-*.o
-*.a
-*.so
-
-# Folders
-_obj
-_test
-vendor
-bin
-.vscode
-.idea
-
 .env
 
-# Architecture specific extensions/prefixes
-*.[568vq]
-[568vq].out
-
-*.cgo1.go
-*.cgo2.c
-_cgo_defun.c
-_cgo_gotypes.go
-_cgo_export.*
-
-_testmain.go
-
-*.exe
-*.test
-*.prof
-*.log
-*.db
-
-# .Dockerfile
-
 .zed
 
 deploy.config
@@ -41,3 +7,4 @@ deploy.config
 node_modules/
 dist/
 coverage/
+*.log