init: initial commit

- ticker / QR ad overlay / break slide graphics (1920×1080) with all
  geometry derived from one shared module (src/shared/obs-geometry.mjs)
- OBS scene-collection generator (scripts/generate-obs-scenes.mjs) and a
  read-only in-dashboard setup verifier, both driven by the same module
- en/sr dashboard i18n selected via bundle config; configschema.json with
  neutral first-run defaults seeded from optional branding config
- install.sh / systemd user service / update.sh for venue deployment
- reference OBS scene collection + profile from a real venue as fixtures

docs/examples/cfg.example.json

@@ -0,0 +1,13 @@
+{
+	"locale": "en",
+	"branding": {
+		"tickerBlurb": "My Venue ♪",
+		"breakHeading": "Stay tuned — there's more!",
+		"sampleQrUrl": "https://example.com/my-venue"
+	},
+	"obs": {
+		"enabled": true,
+		"url": "ws://127.0.0.1:4455",
+		"password": "changeme"
+	}
+}