[ci] Move CI to native Mac mini runner, drop Bitrise

- Remove bitrise.yml (no longer used, replaced by Gitea Actions on
  a native macos-build:host runner - Docker VM-based macos-ctl/
  macos-release runners are dead per earlier session)
- test.yml: push-triggered on any branch except develop/release/main,
  runs fastlane tests (coverage) instead of raw xcodebuild
- beta.yml: PR-to-develop triggered, builds + uploads to TestFlight;
  drops the dead wake/sleep-macos-vm jobs, uses the archive-API
  checkout workaround (see go-gitea/gitea#21819), points at the real
  ci-build.keychain-db instead of the old ci-signing.keychain-db name
- release.yml removed: release/main run nothing automated per the
  agreed branch flow, promotion is manual
- Fastfile: add a tests lane (coverage) so the workflow just calls
  fastlane, matching LC Wallet's convention

fastlane/Fastfile

@@ -3,6 +3,15 @@
 
 default_platform(:ios)
 
+lane :tests do
+  run_tests(
+    scheme: "PediFoods",
+    project: "PediFoods.xcodeproj",
+    clean: true,
+    code_coverage: true
+  )
+end
+
 lane :assemble do |options|
   # Manual signing (team/identity/profile) for the "PediFoods" target is
   # baked directly into PediFoods.xcodeproj's own project settings - not
@@ -15,7 +24,7 @@ lane :assemble do |options|
   build_app(
     scheme: "PediFoods",
     sdk: "iphoneos",
-    export_method: ENV["BITRISE_DISTRIBUTION_METHOD"] || "app-store",
+    export_method: "app-store",
     xcconfig: "fastlane/AppStore.xcconfig",
     xcargs: xcargs,
     derived_data_path: ".build/DerivedData",