feat(booth): add The Booth — ephemeral media drop board for CC sessions

A standing user-level web server (nh3-dev :8090) that renders drop-folders
under ~/booth-data as ephemeral media "booths" so Claude Code sessions can
surface A/B renders and smoke results to the operator, then let them self-wipe.

- Scan-and-serve model, no database, no upload API — a booth is just a folder.
  A folder's own index.html is served verbatim; otherwise an auto-gallery of
  images / webm+mp4 video / audio is rendered, with <file>.txt caption sidecars
  folded in (labels A/B pairs).
- 24h TTL from newest mtime in the tree; background sweeper wipes stale booths.
- Path-traversal + symlink-escape guarded; delete via UI button or DELETE API.
- FastAPI + Jinja2, runs from the checkout under systemctl --user (booth.service),
  alongside the other nh3-dev fleet sidecars. 15 tests, all green.
- Homepage tile added (Apps -> The Booth, siteMonitor /healthz).
- Harden the homepage rsync doc: exclude *.bak* and logs/ so --delete can't
  wipe the host's dated services.yaml backups (footgun found deploying this).

pyproject.toml

@@ -0,0 +1,26 @@
+[project]
+name = "booth"
+version = "0.1.0"
+description = "The Booth — a dead-simple standing web server that scans a data dir of drop-folders and renders each as an ephemeral media 'booth' (image/webm/audio auto-gallery, or a folder's own index.html verbatim). 24h TTL, then the folder is wiped. Fleet tool for CC sessions to surface A/B and smoke results to the operator."
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi>=0.115",
+    "uvicorn[standard]>=0.34",
+    "jinja2>=3.1",
+]
+
+[project.optional-dependencies]
+test = [
+    "pytest>=8.0",
+    "httpx>=0.27",  # fastapi TestClient
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["booth"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]