feat(Capture): 报告识别注入 Vision OCR 参考文本,提升 2B 多模态数字准确率

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

康康/AI/Prompts/VLPrompts.swift

@@ -31,12 +31,38 @@ nonisolated enum VLPrompts {
 
     /// VL 模型不知"今天"是哪天,且 few-shot 示例里写死了日期,
     /// 必须把当天日期显式注入 prompt,模型在无报告日期时才会用对正确的回退值。
-    static func reportExtraction(today: Date = .now) -> String {
+    /// ocrText 非空时把 Vision OCR 的结果作为参考文本注入 —— Vision 抄数字比
+    /// 2B 多模态读密集小字稳;版面与表格结构仍以图片为准。
+    static func reportExtraction(today: Date = .now, ocrText: String = "") -> String {
         let f = DateFormatter()
         f.locale = Locale(identifier: "en_US_POSIX")
         f.dateFormat = "yyyy-MM-dd"
         let todayStr = f.string(from: today)
-        return reportExtractionTemplate.replacingOccurrences(of: "{{TODAY}}", with: todayStr)
+        let ocrSection: String
+        if ocrText.isEmpty {
+            ocrSection = ""
+        } else {
+            ocrSection = """
+
+
+            OCR 参考文本(系统对同一报告做文字识别的结果,可能有错字、串行或漏行;版面与表格结构以图片为准,但数值、小数点以 OCR 文字更可靠):
+            \(clipOCR(ocrText))
+
+            """
+        }
+        return reportExtractionTemplate
+            .replacingOccurrences(of: "{{TODAY}}", with: todayStr)
+            .replacingOccurrences(of: "{{OCR_SECTION}}", with: ocrSection)
+    }
+
+    /// OCR 文本截断:限制进入 prompt 的体量(2B 模型上下文有限)。截到最后一个完整行。
+    static func clipOCR(_ text: String, limit: Int = 1800) -> String {
+        guard text.count > limit else { return text }
+        let clipped = String(text.prefix(limit))
+        if let lastNewline = clipped.lastIndex(of: "\n") {
+            return String(clipped[..<lastNewline]) + "\n(后续内容过长已截断)"
+        }
+        return clipped + "\n(后续内容过长已截断)"
     }
 
     private static let reportExtractionTemplate: String = #"""
@@ -84,7 +110,7 @@ JSON schema(严格):
 输入: 一份春季体检,3 项可读
 输出:
 {"title":"春季年度体检","type":"checkup","report_date":"2026-04-12","institution":"协和医院","page_count":1,"summary":"血脂偏高、其他正常","indicators":[{"name":"低密度脂蛋白","value":"3.84","unit":"mmol/L","range":"< 3.40","status":"high","source_page":1,"source_box":[0.12,0.31,0.76,0.07]},{"name":"谷丙转氨酶","value":"32","unit":"U/L","range":"9 - 50","status":"normal","source_page":1,"source_box":[0.12,0.39,0.76,0.07]},{"name":"空腹血糖","value":"5.2","unit":"mmol/L","range":"3.9 - 6.1","status":"normal","source_page":1,"source_box":[0.12,0.47,0.76,0.07]}]}
-
+{{OCR_SECTION}}
 现在请识别图片并输出 JSON:
 """#