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-tauri/src/services/proxy.rs

@@ -41,7 +41,7 @@ const CLAUDE_MODEL_OVERRIDE_ENV_KEYS: [&str; 9] = [
 
 const CLAUDE_TAKEOVER_HAIKU_MODEL: &str = "claude-haiku-4-5";
 const CLAUDE_TAKEOVER_SONNET_MODEL: &str = "claude-sonnet-4-6";
-const CLAUDE_TAKEOVER_OPUS_MODEL: &str = "claude-opus-4-7";
+const CLAUDE_TAKEOVER_OPUS_MODEL: &str = "claude-opus-4-8";
 // 写给 Claude Code 时沿用文档示例的大写形式；解析侧大小写不敏感。
 const CLAUDE_ONE_M_MARKER_FOR_CLIENT: &str = "[1M]";
 
@@ -2451,7 +2451,7 @@ mod tests {
             "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME",
             Some("claude-sonnet-4.6"),
         );
-        assert_env_str(env, "ANTHROPIC_DEFAULT_OPUS_MODEL", Some("claude-opus-4-7"));
+        assert_env_str(env, "ANTHROPIC_DEFAULT_OPUS_MODEL", Some("claude-opus-4-8"));
         assert_env_str(
             env,
             "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME",
@@ -2522,7 +2522,7 @@ mod tests {
             Some("claude-sonnet-4-6"),
         );
         assert_env_str(env, "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME", Some("gpt-5.4"));
-        assert_env_str(env, "ANTHROPIC_DEFAULT_OPUS_MODEL", Some("claude-opus-4-7"));
+        assert_env_str(env, "ANTHROPIC_DEFAULT_OPUS_MODEL", Some("claude-opus-4-8"));
         assert_env_str(env, "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME", Some("gpt-5.4"));
         assert_env_str(env, "ANTHROPIC_API_KEY", Some(PROXY_TOKEN_PLACEHOLDER));
         assert_env_str(env, "ANTHROPIC_AUTH_TOKEN", None);
@@ -3170,7 +3170,7 @@ model = "gpt-5.1-codex"
             live_env
                 .get("ANTHROPIC_DEFAULT_OPUS_MODEL")
                 .and_then(|v| v.as_str()),
-            Some("claude-opus-4-7[1M]"),
+            Some("claude-opus-4-8[1M]"),
             "Opus role should preserve the current provider 1M capability marker"
         );
         assert_eq!(

src-tauri/src/services/usage_stats.rs

@@ -3214,6 +3214,11 @@ mod tests {
             result.is_some(),
             "Claude Desktop 短路由 claude-haiku-4-5 应能匹配到 claude-haiku-4-5-20251001"
         );
+        let result = find_model_pricing_row(&conn, "anthropic/claude-opus-4.8")?;
+        assert!(
+            result.is_some(),
+            "聚合商点号格式 anthropic/claude-opus-4.8 应能匹配到 claude-opus-4-8"
+        );
 
         // Claude Desktop 旧版/异常包装的非 Anthropic route：claude-gpt-5.5 → gpt-5.5
         let result = find_model_pricing_row(&conn, "claude-gpt-5.5")?;
@@ -3229,6 +3234,16 @@ mod tests {
             result.is_some(),
             "Bedrock/Vertex 风格 Claude 模型 ID 应能归一化到基础 Claude 模型定价"
         );
+        let result = find_model_pricing_row(&conn, "global.anthropic.claude-opus-4-8-v1:0")?;
+        assert!(
+            result.is_some(),
+            "Bedrock 风格 Claude Opus 4.8 模型 ID 应能归一化到基础 Claude 模型定价"
+        );
+        let result = find_model_pricing_row(&conn, "claude-opus-4-8@20260527")?;
+        assert!(
+            result.is_some(),
+            "Vertex 风格 Claude Opus 4.8 模型 ID 应能归一化到基础 Claude 模型定价"
+        );
 
         // Reasoning effort 后缀：没有专门价格时回退到基础模型
         let result = find_model_pricing_row(&conn, "gpt-5.4@low")?;