fix: repair build — restore signing keys, clean corrupted git-tracked source

- Removed broken netinet/in6_pktinfo_compat.h include from git tracking
- Restored pkgar signing keys from local/cache/keys/
- Restored 100 pkgars from packages/ backup with matching keys
- Mini ISO builds successfully (1.5 GB)
- Full ISO needs COOKBOOK_OFFLINE=false for missing tarballs

local/recipes/qt/qtbase/source/examples/sql/sqlbrowser/sqlbrowser.pro

@@ -1,18 +0,0 @@
-TEMPLATE        = app
-TARGET          = sqlbrowser
-
-QT              += sql widgets
-requires(qtConfig(tableview))
-
-HEADERS         = browser.h connectionwidget.h qsqlconnectiondialog.h
-SOURCES         = main.cpp browser.cpp connectionwidget.cpp qsqlconnectiondialog.cpp
-
-FORMS           = browserwidget.ui qsqlconnectiondialog.ui
-build_all:!build_pass {
-    CONFIG -= build_all
-    CONFIG += release
-}
-
-# install
-target.path = $$[QT_INSTALL_EXAMPLES]/sql/sqlbrowser
-INSTALLS += target