feat: add HTTP stream connection with ICY header support

Made-with: Cursor

app/src/main/java/xyz/cottongin/radio247/audio/StreamConnection.kt

@@ -0,0 +1,56 @@
+package xyz.cottongin.radio247.audio
+
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.Response
+import java.io.IOException
+import java.io.InputStream
+import java.time.Duration
+
+class ConnectionFailed(message: String, cause: Throwable? = null) : Exception(message, cause)
+
+class StreamConnection(private val url: String) {
+    private val client = OkHttpClient.Builder()
+        .readTimeout(Duration.ofSeconds(30))
+        .build()
+
+    var metaint: Int? = null
+        private set
+    var inputStream: InputStream? = null
+        private set
+    private var response: Response? = null
+
+    fun open() {
+        val request = Request.Builder()
+            .url(url)
+            .header("Icy-MetaData", "1")
+            .header("User-Agent", "Radio247/1.0")
+            .build()
+
+        try {
+            val resp = client.newCall(request).execute()
+            if (!resp.isSuccessful) {
+                resp.close()
+                throw ConnectionFailed("HTTP ${resp.code}")
+            }
+            response = resp
+            metaint = resp.header("icy-metaint")?.toIntOrNull()
+            inputStream = resp.body?.byteStream()
+                ?: throw ConnectionFailed("Empty response body")
+        } catch (e: IOException) {
+            throw ConnectionFailed("Network error", e)
+        }
+    }
+
+    fun close() {
+        try {
+            inputStream?.close()
+        } catch (_: IOException) {}
+        try {
+            response?.close()
+        } catch (_: IOException) {}
+        response = null
+        inputStream = null
+        metaint = null
+    }
+}