feat: Add first-launch server URL input dialog

Implements a setup dialog on first game launch that allows users to enter
their custom community server URL without rebuilding the APK.

Features:
- Server URL input dialog on first launch
- URL validation (format check)
- Connection test button
- SharedPreferences storage
- Priority: SharedPreferences > AndroidManifest.xml > EA defaults
- Activity restart flow for applying configuration

New files:
- CommunityServerManager.smali (URL management)
- ServerSetupActivity.smali + 4 inner classes (dialog UI)
- res/layout/activity_server_setup.xml (layout)
- SERVER-URL-INPUT-IMPLEMENTATION.md (docs)

Modified files:
- SynergyEnvironmentImpl.smali (SharedPreferences check priority)
- MainActivity.smali (first-launch check + onActivityResult)
- AndroidManifest.xml (declare ServerSetupActivity)

Benefits:
- One APK works with any server
- Easy server switching
- Lower barrier to entry for non-technical users

smali_classes2/com/ea/nimble/SynergyEnvironmentImpl.smali

@@ -956,6 +956,36 @@
     .line 227
     invoke-static {p0}, Lcom/ea/nimble/Log$Helper;->LOGPUBLICFUNC(Ljava/lang/Object;)V
 
+    # 🆕 COMMUNITY PATCH: Check SharedPreferences first (PRIORITY #1)
+    .line 228
+    invoke-static {}, Lcom/ea/nimble/ApplicationEnvironment;->getCurrentApplication()Landroid/app/Application;
+
+    move-result-object v0
+
+    invoke-static {v0}, Lcom/firemint/realracing/CommunityServerManager;->getServerUrl(Landroid/content/Context;)Ljava/lang/String;
+
+    move-result-object v0
+
+    if-eqz v0, :check_manifest
+
+    .line 229
+    invoke-virtual {v0}, Ljava/lang/String;->isEmpty()Z
+
+    move-result v1
+
+    if-nez v1, :check_manifest
+
+    # User has configured a custom server URL via setup dialog
+    const-string v1, "🎯 Using community server from SharedPreferences"
+
+    const-string v2, "SynergyEnvironmentImpl"
+
+    invoke-static {v2, v1}, Landroid/util/Log;->i(Ljava/lang/String;Ljava/lang/String;)I
+
+    return-object v0
+
+    # Continue with normal logic (AndroidManifest.xml or defaults)
+    :check_manifest
     .line 228
     sget-object v0, Lcom/ea/nimble/SynergyEnvironmentImpl$3;->$SwitchMap$com$ea$nimble$NimbleConfiguration:[I