feat: issue search API (keyword in title/description)

app/main.py

@@ -439,3 +439,23 @@ def transition_issue(issue_id: int, new_status: str, bg: BackgroundTasks, db: Se
     }, issue.project_id, db)
     
     return issue
+
+
+
+# ============ Search API ============
+
+@app.get("/search/issues", response_model=List[schemas.IssueResponse])
+def search_issues(
+    q: str,
+    project_id: int = None,
+    skip: int = 0,
+    limit: int = 50,
+    db: Session = Depends(get_db)
+):
+    """Search issues by title or description keyword."""
+    query = db.query(models.Issue).filter(
+        (models.Issue.title.contains(q)) | (models.Issue.description.contains(q))
+    )
+    if project_id:
+        query = query.filter(models.Issue.project_id == project_id)
+    return query.offset(skip).limit(limit).all()