Release v2.6.0 — Performance, Smart Refresh & Repo Cleanup

[hnizdiljan]

Summary

• Smart refresh — Dashboard & Portfolio only reload when data is stale (5 min threshold), reducing unnecessary API calls on every ON_RESUME
• SQL-level filtering in transaction history with 300ms search debounce — faster with large datasets
• Fear & Greed caching (1h TTL) and real-time price upsert in portfolio chart
• Market data fetch order optimized — cache warm-up before price lookups
• DB migration 14→15 — new [fiat, status] index on transactions
• Repository cleanup — archived inactive projects (CryptoBotCore, CryptoBotFunction, AccBotWizard, Docker, accbot-dca, telegram-accbot-converter, Assignments) to archive/

Test plan

• Installed debug APK on physical device (SM-G970F, Android 12) — all features working
• Verify Dashboard doesn't re-fetch market data on quick tab switches
• Verify History search feels responsive with debounce
• Verify portfolio chart shows today's real-time price point
• CI build passes (android-release workflow unaffected by archive moves)

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