fix(usage): 修复 Gemini total 重复累加 cache_read 并补充测试

- write.rs: Gemini usage 提取 total 时不再叠加 cachedContentTokenCount
- 补充 Claude 大 cache_read 场景下 input_tokens 不被扣减的测试
- 补充前端 getEffectiveInputTokens 对 Claude 格式不减 cache_read 的测试

apps/aether-gateway/src/handlers/public/support/user_me_usage.rs

@@ -1340,6 +1340,31 @@ mod tests {
         assert_eq!(payload["cache_creation_ephemeral_1h_input_tokens"], 6);
     }
 
+    #[test]
+    fn user_usage_payload_keeps_claude_effective_input_when_cache_read_is_large() {
+        let item = StoredRequestUsageAudit {
+            provider_name: "Claude".to_string(),
+            model: "claude-sonnet-4-5".to_string(),
+            api_format: Some("claude:chat".to_string()),
+            api_family: Some("claude".to_string()),
+            endpoint_api_format: Some("claude:chat".to_string()),
+            provider_api_family: Some("claude".to_string()),
+            input_tokens: 4941,
+            output_tokens: 973,
+            total_tokens: 59474,
+            cache_creation_input_tokens: 687,
+            cache_read_input_tokens: 52873,
+            ..sample_usage("completed")
+        };
+
+        let payload = build_users_me_usage_record_payload(&item, false, &BTreeMap::new(), false);
+
+        assert_eq!(payload["input_tokens"], 4941);
+        assert_eq!(payload["effective_input_tokens"], 4941);
+        assert_eq!(payload["cache_creation_input_tokens"], 687);
+        assert_eq!(payload["cache_read_input_tokens"], 52873);
+    }
+
     #[test]
     fn user_usage_active_pending_with_failure_signal_is_not_active() {
         let item = StoredRequestUsageAudit {

crates/aether-usage-runtime/src/usage_mapper.rs

@@ -418,6 +418,54 @@ mod tests {
         assert_eq!(usage.cache_read_tokens, 1);
     }
 
+    #[test]
+    fn maps_claude_usage_with_large_cache_read_tokens_without_subtracting_input() {
+        let usage = map_usage(
+            &serde_json::json!({
+                "input_tokens": 4941,
+                "cache_creation_input_tokens": 687,
+                "cache_read_input_tokens": 52873,
+                "output_tokens": 973
+            }),
+            "claude:chat",
+        );
+
+        assert_eq!(usage.input_tokens, 4941);
+        assert_eq!(usage.cache_creation_tokens, 687);
+        assert_eq!(usage.cache_read_tokens, 52873);
+        assert_eq!(usage.output_tokens, 973);
+    }
+
+    #[test]
+    fn maps_claude_usage_with_cache_creation_total_and_zero_ttl_breakdown() {
+        let usage = map_usage(
+            &serde_json::json!({
+                "cache_creation": {
+                    "ephemeral_1h_input_tokens": 0,
+                    "ephemeral_5m_input_tokens": 0
+                },
+                "cache_creation_input_tokens": 2051,
+                "cache_read_input_tokens": 2051,
+                "inference_geo": "inference_geo",
+                "input_tokens": 2095,
+                "output_tokens": 503,
+                "server_tool_use": {
+                    "web_fetch_requests": 2,
+                    "web_search_requests": 0
+                },
+                "service_tier": "standard"
+            }),
+            "claude:chat",
+        );
+
+        assert_eq!(usage.input_tokens, 2095);
+        assert_eq!(usage.cache_creation_tokens, 2051);
+        assert_eq!(usage.cache_creation_ephemeral_5m_tokens, 0);
+        assert_eq!(usage.cache_creation_ephemeral_1h_tokens, 0);
+        assert_eq!(usage.cache_read_tokens, 2051);
+        assert_eq!(usage.output_tokens, 503);
+    }
+
     #[test]
     fn maps_claude_usage_with_ephemeral_cache_breakdown() {
         let usage = map_usage(

crates/aether-usage-runtime/src/write.rs

@@ -2180,16 +2180,7 @@ fn extract_token_counts_from_json(value: &Value) -> Option<(u64, u64, u64)> {
             .get("totalTokenCount")
             .and_then(Value::as_u64)
             .unwrap_or(input + output);
-        let cache_read = usage
-            .get("cachedContentTokenCount")
-            .and_then(Value::as_u64)
-            .unwrap_or_default();
-        let total = if cache_read > 0 {
-            input.saturating_add(output).saturating_add(cache_read)
-        } else {
-            raw_total
-        };
-        return Some((input, output, total));
+        return Some((input, output, raw_total));
     }
 
     if let Some(chunks) = value.get("chunks").and_then(Value::as_array) {
@@ -2353,6 +2344,21 @@ mod tests {
         assert_eq!(tokens, (6, 20, 41883));
     }
 
+    #[test]
+    fn extracts_gemini_usage_tokens_without_adding_cached_content_twice() {
+        let tokens = extract_token_counts_from_json(&json!({
+            "usageMetadata": {
+                "promptTokenCount": 14,
+                "candidatesTokenCount": 6,
+                "cachedContentTokenCount": 2,
+                "totalTokenCount": 20
+            }
+        }))
+        .expect("tokens should exist");
+
+        assert_eq!(tokens, (14, 6, 20));
+    }
+
     #[test]
     fn extracts_usage_tokens_from_last_matching_chunk() {
         let tokens = extract_token_counts_from_json(&json!({

frontend/src/features/usage/__tests__/token-normalization.spec.ts

@@ -26,4 +26,14 @@ describe('usage token normalization', () => {
       api_format: 'openai:chat',
     })).toBe(80)
   })
+
+  it('does not subtract cache read tokens for Claude usage', () => {
+    expect(getEffectiveInputTokens({
+      input_tokens: 4941,
+      cache_creation_input_tokens: 687,
+      cache_read_input_tokens: 52873,
+      output_tokens: 973,
+      api_format: 'claude:chat',
+    })).toBe(4941)
+  })
 })