feat(aiturk): add the connect-to-computer screen (QR scan, code, deep link)

Landing now leads with QR / 8-character code pairing; manual login stays as the secondary action. aiturk://pair links open the same screen and ask for confirmation first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B8ppceaR5s6cvMnm7uGRnf

app/src/main/AndroidManifest.xml

@@ -12,6 +12,9 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_REMOTE_MESSAGING" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+    <!-- AITURK IDE pairing: QR scan. Requested at runtime; typing the code works without it. -->
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-feature android:name="android.hardware.camera" android:required="false" />
 
     <queries>
         <intent>
@@ -38,8 +41,23 @@
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+            <!-- AITURK IDE pairing link: aiturk://pair?v=1&amp;u=...&amp;fp=...&amp;c=... -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="aiturk" android:host="pair" />
+            </intent-filter>
         </activity>
 
+        <activity
+            android:name=".ui.aiturkpair.AiturkQrCaptureActivity"
+            android:exported="false"
+            android:screenOrientation="fullSensor"
+            android:stateNotNeeded="true"
+            android:theme="@style/zxing_CaptureTheme"
+            android:windowSoftInputMode="stateAlwaysHidden" />
+
         <service
             android:name=".assistant.AssistantService"
             android:permission="android.permission.BIND_VOICE_INTERACTION"