feat: Android companion app improvements & gateway URL camera payloads (#13541)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 9c179c9c3192ec76059f5caac1e8de8bdfb257ce
Co-authored-by: smartprogrammer93 <33181301+smartprogrammer93@users.noreply.github.com>
Co-authored-by: steipete <58493+steipete@users.noreply.github.com>
Reviewed-by: @steipete

apps/android/app/src/test/java/ai/openclaw/android/node/AppUpdateHandlerTest.kt

@@ -0,0 +1,65 @@
+package ai.openclaw.android.node
+
+import java.io.File
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+class AppUpdateHandlerTest {
+  @Test
+  fun parseAppUpdateRequest_acceptsHttpsWithMatchingHost() {
+    val req =
+      parseAppUpdateRequest(
+        paramsJson =
+          """{"url":"https://gw.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+
+    assertEquals("https://gw.example.com/releases/openclaw.apk", req.url)
+    assertEquals("a".repeat(64), req.expectedSha256)
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsNonHttps() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"http://gw.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsHostMismatch() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"https://evil.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsInvalidSha256() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"https://gw.example.com/releases/openclaw.apk","sha256":"bad"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun sha256Hex_computesExpectedDigest() {
+    val tmp = File.createTempFile("openclaw-update-hash", ".bin")
+    try {
+      tmp.writeText("hello", Charsets.UTF_8)
+      assertEquals(
+        "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
+        sha256Hex(tmp),
+      )
+    } finally {
+      tmp.delete()
+    }
+  }
+}