Docs: rewrite README with clear Docker and Docker Compose instructions; refactor app into package (auth, admin, pages, db); keep single entrypoint app.py

app/admin.py

@@ -0,0 +1,73 @@
+import uuid as uuid_lib
+from datetime import datetime
+from flask import Blueprint, render_template, request, redirect, url_for, flash
+
+from .db import get_db
+from .auth import login_required
+
+
+admin_bp = Blueprint("admin", __name__, url_prefix="/admin")
+
+
+@admin_bp.route("/", methods=["GET", "POST"])
+def index():
+    login_required()
+    db = get_db()
+    if request.method == "POST":
+        title = request.form.get("title", "").strip()
+        html = request.form.get("html", "").strip()
+        if not html:
+            flash("HTML не может быть пустым.", "error")
+        else:
+            uid = uuid_lib.uuid4().hex
+            db.execute(
+                "INSERT INTO pages (uuid, title, html, created_at) VALUES (?, ?, ?, ?)",
+                (uid, title, html, datetime.utcnow().isoformat(timespec="seconds")),
+            )
+            db.commit()
+            flash("Страница опубликована.", "success")
+            return redirect(url_for("admin.index"))
+
+    pages = db.execute(
+        "SELECT id, uuid, title, created_at FROM pages ORDER BY id DESC"
+    ).fetchall()
+    from flask import request as _request  # local import
+
+    base_url = _request.host_url.rstrip("/")
+    return render_template("admin.html", pages=pages, base_url=base_url)
+
+
+@admin_bp.route("/edit/<int:pid>", methods=["GET", "POST"])
+def edit(pid: int):
+    login_required()
+    db = get_db()
+    if request.method == "POST":
+        title = request.form.get("title", "").strip()
+        html = request.form.get("html", "").strip()
+        if not html:
+            flash("HTML не может быть пустым.", "error")
+        else:
+            db.execute("UPDATE pages SET title = ?, html = ? WHERE id = ?", (title, html, pid))
+            db.commit()
+            flash("Страница обновлена.", "success")
+            return redirect(url_for("admin.index"))
+
+    row = db.execute("SELECT id, uuid, title, html, created_at FROM pages WHERE id = ?", (pid,)).fetchone()
+    if row is None:
+        from flask import abort as _abort
+        _abort(404)
+    return render_template("edit.html", page=row)
+
+
+@admin_bp.route("/delete/<int:pid>", methods=["POST"])
+def delete(pid: int):
+    login_required()
+    db = get_db()
+    cur = db.execute("DELETE FROM pages WHERE id = ?", (pid,))
+    db.commit()
+    if cur.rowcount:
+        flash("Страница удалена.", "success")
+    else:
+        flash("Страница не найдена.", "error")
+    return redirect(url_for("admin.index"))
+