Initial commit — iOS share extension for filing Gitea issues

Two-target Xcode project (xcodegen spec). The GiteaIssue container app
holds the base URL + personal access token in a shared keychain group;
the GiteaIssueShare extension reads them, surfaces a repo picker (with
recents) and a title/notes form, then creates the issue, uploads the
screenshot as an asset, and patches the body to embed it inline.

Min iOS 26.0, signing team V3PF3M6B6U.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,25 @@
+## macOS
+.DS_Store
+
+## Xcode
+build/
+*.xcuserstate
+xcuserdata/
+*.xcworkspace
+DerivedData/
+*.moved-aside
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Generated by xcodegen — keep tracked so the builder doesn't need xcodegen installed
+# (intentionally NOT ignoring *.xcodeproj)
+
+## Swift Package Manager
+.swiftpm/
+.build/
+Packages/
+Package.pins
+Package.resolved
+*.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/