feat(usage): filter-driven Hero with cache-normalized totals

- Normalize OpenAI/Gemini input_tokens semantics in SQL via the new
  fresh_input_sql helper (cache_read subtracted at query time, no data
  migration). Recovers correct cache hit rates for Codex/Gemini.
- Add get_usage_summary_by_app endpoint for per-app split (single
  UNION ALL + GROUP BY, avoids N+1).
- Replace UsageSummaryCards + AppBreakdownRail with a single
  filter-driven UsageHero card; clicking a filter button now truly
  changes the displayed numbers and the title accent color.
- Tighten KNOWN_APP_TYPES to the 3 app_types whose token data is
  reliably collected (claude/codex/gemini); hide claude-desktop,
  hermes, opencode, openclaw filter buttons and i18n keys.
- Flag cache_creation as N/A for OpenAI-style protocols (Codex,
  Gemini); show a "partial" tooltip when the All view mixes both
  protocol families.

src-tauri/src/services/mod.rs

@@ -14,6 +14,7 @@ pub mod session_usage_codex;
 pub mod session_usage_gemini;
 pub mod skill;
 pub mod speedtest;
+pub mod sql_helpers;
 pub mod stream_check;
 pub mod subscription;
 pub mod usage_cache;
@@ -35,5 +36,5 @@ pub use usage_cache::UsageCache;
 #[allow(unused_imports)]
 pub use usage_stats::{
     DailyStats, LogFilters, ModelStats, PaginatedLogs, ProviderLimitStatus, ProviderStats,
-    RequestLogDetail, UsageSummary,
+    RequestLogDetail, UsageSummary, UsageSummaryByApp,
 };