feat(insta-lab): keyword_extractor.extract_with_weights for category proportions

insta-lab/app/keyword_extractor.py

@@ -81,3 +81,22 @@ def extract_for_category(category: str, limit: int = KEYWORDS_PER_CATEGORY) -> L
         })
         saved.append({"id": kid, **kw, "category": category})
     return saved
+
+
+def extract_with_weights(weights: Dict[str, float], total_limit: int) -> List[Dict[str, Any]]:
+    """카테고리 가중치 비율대로 키워드를 분배 추출."""
+    from .config import DEFAULT_CATEGORY_SEEDS
+    if not weights or sum(weights.values()) == 0:
+        cats = list(DEFAULT_CATEGORY_SEEDS.keys())
+        weights = {c: 1.0 for c in cats}
+
+    total_weight = sum(weights.values())
+    out: List[Dict[str, Any]] = []
+    for category, w in weights.items():
+        if w <= 0:
+            continue
+        per_cat = round(total_limit * w / total_weight)
+        if per_cat <= 0:
+            continue
+        out.extend(extract_for_category(category, limit=per_cat))
+    return out