chore: scaffold denpa-radio repo

.gitignore

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+# superpowers session output — local only
+docs/superpowers/
+
+# generated configs and secrets
+config/*.env
+!config/*.env.example
+config/icecast.xml
+
+# runtime data
+data/
+
+# OS junk
+.DS_Store
+Thumbs.db

docker-compose.yml

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+name: 'denpa-radio'
+
+services:
+  # icecast added in Task 3
+  # liquidsoap added in Task 6