Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

models/user.py

@@ -0,0 +1,11 @@
+from datetime import datetime
+
+from pydantic import EmailStr
+from sqlmodel import SQLModel, Field
+
+
+class User(SQLModel, table=True):
+    id: int = Field(primary_key=True)
+    email: EmailStr = Field(index=True, unique=True)
+    password: str | None = Field(default=None, nullable=True)
+    created_at: datetime = Field(default_factory=datetime.utcnow)