fix: reach CloudKit instead of gating on unreliable entitlement introspection (#29)

iCloud sync always failed with "This build does not have the CloudKit
entitlement required for iCloud sync." on normal Debug/device builds.

`cloudKitContainer()` gated construction on `isEntitlementConfigurationAvailable()`,
which inspected `Info.plist` keys and an `archived-expanded-entitlements.xcent`
file. Entitlements live in the code signature, not `Info.plist`, and the `.xcent`
file only exists in archived/distribution builds — so the check returned false for
a correctly-signed development build, the container was never created, and every
path reported `.missingEntitlement`.

Stop introspecting entitlements. Always construct `CKContainer.default()` and let
CloudKit's own `accountStatus()` drive availability. When the entitlement is
genuinely absent, CloudKit surfaces `.missingEntitlement` / `.badContainer` /
`.permissionFailure`, which `accountStatus()` now maps back to the "no entitlement"
message — preserving that signal without the false negative.

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