feat(types): tipo Webpage + .gitignore del subrepo (issue 0027)

- examples/types.yaml: nuevo tipo Webpage (icono ti-file-text, fields
  url/title/status_code/content_type/fetched_at/html_path/markdown_path/
  screenshot_path/text_length/lang). Url queda como link suelto.
- types_registry.cpp: anade ti-file-text al mapa de codepoints Tabler.
- .gitignore: cache/, graph_explorer.db (jobs+layouts), build artifacts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,13 @@
+# SQLite app DB (jobs + layouts) — local de cada PC
+graph_explorer.db
+graph_explorer.db-shm
+graph_explorer.db-wal
+
+# Cache de documentos descargados por enrichers (issue 0027)
+cache/
+
+# Build artifacts
+build/
+*.exe
+*.o
+*.obj