feat: AR-House initial commit

data_fetchers/base.py

@@ -0,0 +1,13 @@
+"""Common types and constants para data fetchers."""
+
+
+class FetcherError(Exception):
+    """Raised when a fetcher fails. Caught por runner para fail-soft."""
+    pass
+
+
+# User-Agent para requests HTTP (algunas APIs como Nominatim lo requieren)
+USER_AGENT = "AR-House/0.1.0 (real-estate-analysis-tool; +https://localhost)"
+
+# Timeouts default
+DEFAULT_TIMEOUT = 15  # segundos para requests HTTP