Add IntelliJ IDEA project files to version control, configure Python 3.13 SDK, and update `.gitignore`.

.gitignore

@@ -1,2 +1 @@
-.idea
 .venv

.idea/NotificationChannel.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.idea/dictionaries" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea/inspectionProfiles" />
+      <excludeFolder url="file://$MODULE_DIR$/.venv" />
+    </content>
+    <orderEntry type="jdk" jdkName="Python 3.13 (NotificationChannel)" jdkType="Python SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+  <component name="PackageRequirementsSettings">
+    <option name="versionSpecifier" value="Don't specify version" />
+    <option name="removeUnused" value="true" />
+    <option name="modifyBaseFiles" value="true" />
+  </component>
+</module>

.idea/dictionaries/project.xml

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+<component name="ProjectDictionaryState">
+  <dictionary name="project">
+    <words>
+      <w>buzup</w>
+      <w>levelname</w>
+    </words>
+  </dictionary>
+</component>

.idea/inspectionProfiles/Project_Default.xml

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+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="DuplicatedCode" enabled="true" level="WEAK WARNING" enabled_by_default="true">
+      <Languages>
+        <language minSize="70" name="Python" />
+      </Languages>
+    </inspection_tool>
+    <inspection_tool class="IncorrectHttpHeaderInspection" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="customHeaders">
+        <set>
+          <option value="X-Engine-Key" />
+          <option value="X-Engine-QA-Key" />
+        </set>
+      </option>
+    </inspection_tool>
+  </profile>
+</component>

.idea/inspectionProfiles/profiles_settings.xml

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+<component name="InspectionProjectProfileManager">
+  <settings>
+    <option name="USE_PROJECT_PROFILE" value="false" />
+    <version value="1.0" />
+  </settings>
+</component>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Black">
+    <option name="enabledOnReformat" value="true" />
+    <option name="enabledOnSave" value="true" />
+    <option name="sdkName" value="Python 3.13 (NotificationChannel)" />
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.13 (NotificationChannel)" project-jdk-type="Python SDK" />
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/NotificationChannel.iml" filepath="$PROJECT_DIR$/.idea/NotificationChannel.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>