release: add universal 1.0.0 APK

Add the universal Android 1.0.0 APK (arm64-v8a, armeabi-v7a, x86_64) with SHA-256 checksum and release notes.

releases/README.md

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+# CarDash 1.0.0 — universal Android release
+
+- **File:** `cardash-android-1.0.0.apk`
+- **Package:** `com.wasp.cardash_launcher`
+- **Version:** 1.0.0 (versionCode 12)
+- **Size:** 54M
+- **ABIs:** arm64-v8a, armeabi-v7a, x86_64
+- **SHA-256:** `9a75258e14432d74eedb866ac4043179496234c252a877d25b709c2a2ff4d9a2`
+- **Source:** commit `d28bfea`
+
+This is a single universal APK containing all supported Android ABIs. It is
+signed with the project's existing debug signing configuration, so it is suitable
+for sideloading and local testing but is **not** a Play Store/production-signed
+artifact.
+
+Install with:
+
+```bash
+adb install -r cardash-android-1.0.0.apk
+```
+
+Verify the download with:
+
+```bash
+sha256sum -c cardash-android-1.0.0.apk.sha256
+```

releases/cardash-android-1.0.0.apk.sha256

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+9a75258e14432d74eedb866ac4043179496234c252a877d25b709c2a2ff4d9a2  releases/cardash-android-1.0.0.apk