Detect redirect-like instructions and show warning

When recipe instructions are just a link to another site (e.g.
"ide kattintva, a Kiskegyed oldalán találod"), display a warning
instead of silently accepting non-useful instruction text.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/main.py

@@ -58,6 +58,18 @@ def _hash_password(password: str) -> str:
     return hashlib.sha256(password.encode("utf-8")).hexdigest()
 
 
+_REDIRECT_PATTERNS = ["ide kattintva", "oldalán találod", "teljes recept itt",
+                      "kattints ide", "eredeti recept"]
+
+
+def _is_redirect_instructions(instructions: list[str]) -> bool:
+    """Check if instructions are just a redirect to another site."""
+    if len(instructions) > 2:
+        return False
+    text = " ".join(instructions).lower()
+    return any(p in text for p in _REDIRECT_PATTERNS)
+
+
 # ---------------------------------------------------------------------------
 # Routes
 # ---------------------------------------------------------------------------
@@ -182,8 +194,12 @@ def scrape_url():
         real_ingredients = [i for i in data.get("ingredients", []) if "group" not in i]
         if not real_ingredients:
             warnings.append("A recept nem tartalmaz hozzávalókat.")
-        if not data.get("instructions"):
+        instructions = data.get("instructions", [])
+        if not instructions:
             warnings.append("A recept nem tartalmaz elkészítési lépéseket.")
+        elif _is_redirect_instructions(instructions):
+            warnings.append("Az elkészítés egy másik oldalra mutat. "
+                            "A recept valószínűleg nem tartalmaz valódi lépéseket.")
 
         return jsonify({"ok": True, "data": data, "duplicate": duplicate,
                         "tandoor_duplicate": tandoor_duplicate,