fix: 优化整个项目内容

backend/app/main.py

@@ -62,7 +62,7 @@ def _migrate_mistake_columns() -> None:
 
 _migrate_mistake_columns()
 
-app = FastAPI(title="公考助手 API", version="1.0.0")
+app = FastAPI(title="学习伙伴 API", version="1.0.0")
 UPLOAD_DIR = Path(os.getenv("UPLOAD_DIR", "/app/uploads"))
 UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
 app.mount("/uploads", StaticFiles(directory=str(UPLOAD_DIR)), name="uploads")
@@ -273,9 +273,23 @@ def _restore_upload_url_from_zip(url: str | None, zip_ref: zipfile.ZipFile) -> s
 @app.post("/api/upload")
 async def upload_file(file: UploadFile = File(...)):
     suffix = Path(file.filename or "").suffix.lower()
-    allowed = {".pdf", ".doc", ".docx", ".jpg", ".jpeg", ".png", ".webp"}
+    allowed = {".pdf", ".doc", ".docx", ".jpg", ".jpeg", ".png", ".webp", ".heic", ".heif"}
+    mime_to_suffix = {
+        "application/pdf": ".pdf",
+        "application/msword": ".doc",
+        "application/vnd.openxmlformats-officedocument.wordprocessingml.document": ".docx",
+        "image/jpeg": ".jpg",
+        "image/png": ".png",
+        "image/webp": ".webp",
+        "image/heic": ".heic",
+        "image/heif": ".heif",
+    }
     if suffix not in allowed:
-        raise HTTPException(status_code=400, detail="不支持的文件类型")
+        guessed = mime_to_suffix.get((file.content_type or "").lower())
+        if guessed:
+            suffix = guessed
+        else:
+            raise HTTPException(status_code=400, detail="不支持的文件类型")
     content = await file.read()
     if len(content) > 50 * 1024 * 1024:
         raise HTTPException(status_code=400, detail="文件不能超过 50MB")
@@ -452,7 +466,7 @@ def export_mistakes_pdf(
     left = 48
     right = 560
     max_width = right - left
-    pdf.drawString(left, y, "公考助手 - 错题导出")
+    pdf.drawString(left, y, "学习伙伴 - 错题导出")
     y -= 28
     for idx, item in enumerate(items, start=1):
         if y < 90:
@@ -497,7 +511,7 @@ def export_mistakes_docx(
     id_list = [int(x) for x in ids.split(",") if x.strip().isdigit()] if ids else None
     items = _query_mistakes_for_export(db, category, start_date, end_date, id_list)
     doc = Document()
-    doc.add_heading("公考助手 - 错题导出", level=1)
+    doc.add_heading("学习伙伴 - 错题导出", level=1)
     for idx, item in enumerate(items, start=1):
         blocks = _mistake_export_blocks(item, content_mode)
         for bi, block in enumerate(blocks):
@@ -934,9 +948,11 @@ async def parse_ocr(payload: OcrParseIn):
         ".jpeg": "image/jpeg",
         ".png": "image/png",
         ".webp": "image/webp",
+        ".heic": "image/heic",
+        ".heif": "image/heif",
     }.get(suffix)
     if not mime:
-        raise HTTPException(status_code=400, detail="仅支持 JPG/PNG/WebP OCR")
+        raise HTTPException(status_code=400, detail="仅支持 JPG/PNG/WebP/HEIC OCR")
 
     b64 = base64.b64encode(target.read_bytes()).decode("utf-8")
     image_data_url = f"data:{mime};base64,{b64}"
@@ -952,7 +968,7 @@ async def parse_ocr(payload: OcrParseIn):
         ocr_prompt = f"{ocr_prompt}\n补充要求：{payload.prompt}"
 
     raw_text = await _call_qwen_vision(
-        "你是公考题目OCR与结构化助手。输出必须是 JSON，不要额外解释。",
+        "你是题目 OCR 与结构化助手。输出必须是 JSON，不要额外解释。",
         ocr_prompt,
         image_data_url,
     )
@@ -1033,7 +1049,7 @@ async def ai_analyze_mistake(item_id: int, db: Session = Depends(get_db)):
     if not item:
         raise HTTPException(status_code=404, detail="Mistake not found")
     content = await _call_qwen(
-        "你是公考备考教练，请输出结构化、可执行的错题分析。",
+        "你是学习教练，请输出结构化、可执行的错题分析。",
         (
             f"错题标题: {item.title}\n"
             f"分类: {item.category}\n"
@@ -1059,7 +1075,7 @@ async def ai_study_plan(payload: AiStudyPlanIn, db: Session = Depends(get_db)):
     mistake_text = ", ".join([f"{m.category}-{m.title}" for m in recent_mistakes]) or "暂无错题数据"
 
     content = await _call_qwen(
-        "你是公考学习规划师，请给出可执行计划并尽量量化。",
+        "你是学习规划师，请给出可执行计划并尽量量化。",
         (
             f"目标: {payload.goal}\n"
             f"剩余天数: {payload.days_left}\n"