refactor: rename dashboards→webviews, unique applicationId per flavor

Each flavor gets applicationIdSuffix = ".<name>" so the Bravia
getApplicationList API returns a distinct URI per webview, enabling
Control4 to launch specific flavors independently.

BREAKING CHANGE: applicationId changed from cz.c3c.webviewkiosk to
cz.c3c.webviewkiosk.<flavor> — uninstall old app before reinstalling.
BuildConfig.DASHBOARD_URL renamed to WEBVIEW_URL.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -1,7 +1,7 @@
 # android-webview-kiosk
 
-Android TV app: fullscreen WebView showing a configurable Grafana dashboard.
-Multiple APK flavors built from `dashboards.yaml` (repo root) — one APK per entry.
+Android TV app: fullscreen WebView kiosk.
+Multiple APK flavors built from `webviews.yaml` (repo root) — one APK per entry.
 Runs on the living-room Sony Bravia KD-65XE9305 (Android 8.0, API 26;
 Android System WebView updates independently via Play Store — currently v138).
 Launched remotely through the Bravia REST IP-control API by Control4
@@ -40,17 +40,18 @@ replaces it before any gradle command runs.
 
 - Package/applicationId: `cz.c3c.webviewkiosk`; repo name keeps the
   `android-` prefix, the package can't (hyphens illegal).
-- Dashboard URL + label configured in `dashboards.yaml` (repo root). Each
-  entry becomes a product flavor; `BuildConfig.DASHBOARD_URL` is injected
-  at build time. Changing a URL means editing the YAML, rebuilding, resideloading.
-  Intentional: keeps Control4 integration to a single parameterless launch call.
+- Webview URL + label configured in `webviews.yaml` (repo root). Each
+  entry becomes a product flavor with `applicationIdSuffix = ".<name>"`;
+  `BuildConfig.WEBVIEW_URL` is injected at build time. Changing a URL means
+  editing the YAML, rebuilding, resideloading. Intentional: keeps Control4
+  integration to a single parameterless launch call.
 - `signing/release.keystore` is committed on purpose (private repo,
   LAN-only kiosk) so every build is upgrade-compatible. Don't reuse the key.
 - minSdk 26 is a hard floor — the TV never gets newer Android.
 - `LEANBACK_LAUNCHER` category + `android:banner` are what make the app
   visible to the Bravia API's `getApplicationList`/`setActiveApp`. Don't
   remove either.
-- App URI (from `getApplicationList`):
-  `com.sony.dtv.cz.c3c.webviewkiosk.cz.c3c.webviewkiosk.MainActivity`
+- App URIs (from `getApplicationList`) are per-flavor, e.g. weather:
+  `com.sony.dtv.cz.c3c.webviewkiosk.weather.cz.c3c.webviewkiosk.weather.MainActivity`
 - `setActiveApp` alone wakes the TV from standby — no separate
   `setPowerStatus` call needed. Control4 driver can skip the wake step.