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>

Taskfile.yml

@@ -7,10 +7,10 @@ tasks:
   build:
     desc: Build the binary
     deps: [generate]
-    cmds: [go build -o bin/hostexecutor ./cmd/hostexecutor]
+    cmds: [go build -o bin/__PROJECT_NAME__ ./cmd/__PROJECT_NAME__]
   run:
     deps: [build]
-    cmds: [./bin/hostexecutor]
+    cmds: [./bin/__PROJECT_NAME__]
   test:
     desc: Run all tests
     deps: [generate]