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>

GiteaIssueShare/GiteaIssueShare.entitlements

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>group.com.treytartt.GiteaIssue</string>
+    </array>
+    <key>keychain-access-groups</key>
+    <array>
+        <string>$(AppIdentifierPrefix)com.treytartt.GiteaIssue</string>
+    </array>
+</dict>
+</plist>