Initial commit: LCK Control Android app

Multi-module Android app (app/shared/sdk) with backend-driven auth,
Quest Platform SDK login, YouTube/Twitch OAuth linking, stream
management via AIDL service. Compose UI with Hilt DI.

shared/src/main/java/com/omixlab/lckcontrol/shared/LinkedAccount.kt

@@ -0,0 +1,36 @@
+package com.omixlab.lckcontrol.shared
+
+import android.os.Parcel
+import android.os.Parcelable
+
+data class LinkedAccount(
+    val serviceId: String,
+    val displayName: String,
+    val accountId: String,
+    val avatarUrl: String? = null,
+    val isAuthenticated: Boolean = false,
+) : Parcelable {
+
+    constructor(parcel: Parcel) : this(
+        serviceId = parcel.readString()!!,
+        displayName = parcel.readString()!!,
+        accountId = parcel.readString()!!,
+        avatarUrl = parcel.readString(),
+        isAuthenticated = parcel.readInt() != 0,
+    )
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) {
+        parcel.writeString(serviceId)
+        parcel.writeString(displayName)
+        parcel.writeString(accountId)
+        parcel.writeString(avatarUrl)
+        parcel.writeInt(if (isAuthenticated) 1 else 0)
+    }
+
+    override fun describeContents(): Int = 0
+
+    companion object CREATOR : Parcelable.Creator<LinkedAccount> {
+        override fun createFromParcel(parcel: Parcel) = LinkedAccount(parcel)
+        override fun newArray(size: Int) = arrayOfNulls<LinkedAccount>(size)
+    }
+}