fix(template): parameterize scaffold with __PROJECT_NAME__/__MODULE_PATH__ (gitea-mcp#44)

template-go-web was seeded from the real `hostexecutor` project and never
parameterized: go.mod hardcoded `module gitea.d-ma.be/mathias/hostexecutor` and
`hostexecutor` appeared throughout (cmd dir, Dockerfile, Taskfile, CI, context
docs). create_project_from_template therefore substituted nothing and returned
a "no placeholders" partial_failure on the zero-config default path.

Replaced the full module path with __MODULE_PATH__ and the bare project name
with __PROJECT_NAME__ (incl. renaming cmd/hostexecutor → cmd/__PROJECT_NAME__),
matching the substitution the tool performs. Also drops the stale gitea.d-ma.be
host (the placeholder resolves to git.d-ma.be/<owner>/<name>).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cmd/__PROJECT_NAME__/main.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"os"
 
-	"gitea.d-ma.be/mathias/hostexecutor/internal/web"
+	"__MODULE_PATH__/internal/web"
 )
 
 func main() {
@@ -19,7 +19,7 @@ func main() {
 	mux.Handle("/", web.NewHandler())
 
 	addr := ":8080"
-	logger.Info("hostexecutor starting", "addr", addr)
+	logger.Info("__PROJECT_NAME__ starting", "addr", addr)
 	if err := http.ListenAndServe(addr, mux); err != nil {
 		logger.Error("server stopped", "err", err)
 		os.Exit(1)