ci(native-image): add x86_v2 arch to build matrix

Adds x86-64-v2 microarchitecture as a second build target alongside
default. Images tagged with -x86_v2 suffix; GHA cache scoped per arch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.idea/gradle.xml

@@ -5,25 +5,6 @@
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="ms-21" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-            <option value="$PROJECT_DIR$/modules" />
-            <option value="$PROJECT_DIR$/modules/account" />
-            <option value="$PROJECT_DIR$/modules/api" />
-            <option value="$PROJECT_DIR$/modules/bot-platform" />
-            <option value="$PROJECT_DIR$/modules/coordinator" />
-            <option value="$PROJECT_DIR$/modules/core" />
-            <option value="$PROJECT_DIR$/modules/io" />
-            <option value="$PROJECT_DIR$/modules/json" />
-            <option value="$PROJECT_DIR$/modules/official-bots" />
-            <option value="$PROJECT_DIR$/modules/rule" />
-            <option value="$PROJECT_DIR$/modules/security" />
-            <option value="$PROJECT_DIR$/modules/store" />
-            <option value="$PROJECT_DIR$/modules/ws" />
-          </set>
-        </option>
       </GradleProjectSettings>
     </option>
   </component>

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="FrameworkDetectionExcludesConfiguration">

.idea/vcs.xml

@@ -1,11 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="CommitMessageInspectionProfile">
-    <profile version="1.0">
-      <inspection_tool class="CommitFormat" enabled="true" level="WARNING" enabled_by_default="true" />
-      <inspection_tool class="CommitNamingConvention" enabled="true" level="WARNING" enabled_by_default="true" />
-    </profile>
-  </component>
   <component name="IssueNavigationConfiguration">
     <option name="links">
       <list>