feat(offline): standardize native storage on community SQLite

[rdlabo]

Summary

• replace the Capawesome SQLite-specific offline adapter with @capacitor-community/sqlite
• store a cryptographically random first-install SQLCipher secret in the plugin's Keychain / Android keystore
• keep the community SQLite runtime application-supplied so web-only offline bundles have no native plugin dependency
• remove Capawesome SQLite and Secure Preferences setup from the public API and docs

Verification

• npm run lint
• npm run prebuild
• npm test (455 tests across demo and published libraries)
• production offline FESM has no @capacitor-community/sqlite runtime import
• git diff --check

Migration

Offline consumers install the @capacitor-community/sqlite major matching Capacitor, keep CapacitorSQLite encryption enabled, remove Capawesome SQLite/Secure Preferences wiring, and pass both sqliteConnection: new SQLiteConnection(CapacitorSQLite) and a cryptographically random first-install createEncryptionKey generator. Android apps must exclude the database and secret storage from backup/device transfer as documented.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.