Import lists from CSV or text and match each entry

The list editor gets an Import button. A .csv/.tsv/.txt file or pasted
text is parsed on the server: header columns (Title, Year, Artist or
Director, Note, Rank), numbered lines and trailing "(1999)" years are
understood, and Canon's own export round-trips.

Each row is then searched with the list's provider and scored. A row is
matched automatically only when one result fits exactly and nothing else
fits as well; a year or artist in the file breaks ties, an exact title
beats a bracketed version like "(Live)", and "Artist - Title" lines are
tried both ways. Custom lists need a year or subtitle to be certain.
Everything else is shown for review with a recommended pick, the other
results, "Add as written", Skip, and a search-again box. Entries are
added in file order after the existing ones, with any notes from the
file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/server.go

@@ -146,6 +146,8 @@ func (s *Server) Handler() http.Handler {
 	api("POST /api/items/{id}/refresh", s.apiRefreshItem)
 	api("DELETE /api/items/{id}", s.apiDeleteItem)
 	api("GET /api/search", s.apiSearch)
+	api("POST /api/import/parse", s.apiImportParse)
+	api("POST /api/lists/{id}/import/match", s.apiImportMatch)
 	api("GET /api/settings", s.apiSettings)
 	api("PUT /api/settings", s.apiUpdateSettings)
 	api("POST /api/settings/avatar", s.apiUploadAvatar)