Implement Arch and some additional changes

Assets/Data/Packages/Aur.asset

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+  m_Name: Aur
+  m_EditorClassIdentifier: 
+  id: pkg_aur
+  displayName: AUR
+  slot: 1
+  rarity: 4
+  description: start each TURN with a generated C/Rust card. on Arch, any rarity and costs 1 less this turn; off-distro, common only with no discount.
+  flavourText: probably maintained by one person and a shell script named pls-work.sh.
+  designNotes: Arch 4-star Runtime package. Scope TURN. On Arch: generate random C/Rust card up to Legendary rarity and apply -1 temporary cost. Off-distro: generate Common C/Rust only with no discount. Uses existing generated-card pool; requiresSystem card-generation if no eligible pool is available. Runtime slot intentionally does not conflict with systemd Daemon.
+  intendedDistroId: arch
+  requiresSystem:
+  - card-generation
+  offDistroEffect: {kind: 26, amount: 0, threshold: 0, refundCycle: 0, cleanseDebuffs: 0, enableFedoraSecondCardPassive: 0, persistArchBtw: 0}
+  onDistroEffect: {kind: 26, amount: 1, threshold: 3, refundCycle: 0, cleanseDebuffs: 0, enableFedoraSecondCardPassive: 0, persistArchBtw: 0}