feat: 初始版本，圆角主题与首次管理员引导

app/blueprints/comments.py

@@ -0,0 +1,17 @@
+from flask import Blueprint, request, redirect, url_for
+from flask_login import login_required, current_user
+from ..extensions import db
+from ..models import Comment, Post
+
+bp = Blueprint("comments", __name__, url_prefix="/comments")
+
+@bp.route("/create/<int:post_id>", methods=["POST"])
+@login_required
+def create(post_id):
+    post = Post.query.get_or_404(post_id)
+    body = request.form.get("body")
+    if body:
+        c = Comment(post_id=post.id, user_id=current_user.id, body=body)
+        db.session.add(c)
+        db.session.commit()
+    return redirect(url_for("posts.detail", post_id=post.id))