Upgrade default Claude Opus model to 4.8

Bump the default Opus route/model from claude-opus-4-7 to claude-opus-4-8
across provider presets (claude, claudeDesktop, hermes, openclaw, opencode,
universal), i18n locales (zh/en/ja/zh-TW), pricing seed data, and the
user-manual docs.

- Add claude-opus-4-8 pricing row ($5/$25/$0.50/$6.25); keep the 4-7 row
  for historical usage stats (seeded via INSERT OR IGNORE).
- Claude Desktop proxy: accept bidirectional opus 4-7 <-> 4-8 route alias
  during rollout so previously saved routes keep resolving.
- thinking_optimizer: route opus-4-8 through adaptive thinking and normalize
  dotted model ids (also fixes dotted 4-6/4-7 falling back to legacy).
- usage_stats: normalize Bedrock/Vertex/aggregator opus-4-8 ids to base
  pricing.

Also merge role:"system" messages into the Gemini systemInstruction in the
Anthropic->Gemini transform.

src/config/universalProviderPresets.ts

@@ -44,7 +44,7 @@ const NEWAPI_DEFAULT_MODELS: UniversalProviderModels = {
     model: "claude-sonnet-4-6",
     haikuModel: "claude-haiku-4-5-20251001",
     sonnetModel: "claude-sonnet-4-6",
-    opusModel: "claude-opus-4-7",
+    opusModel: "claude-opus-4-8",
   },
   codex: {
     model: "gpt-5.4",