Initial dictionary producer: builddict, word-list sources, DAWG build + CI

- builddict drives the de-internalized scrabble-solver dictdawg/wordlist builders
  (pinned v1.0.0) to produce the three DAWGs (en_sowpods, ru_scrabble, ru_erudit),
  byte-identical to the solver's committed fixtures (same dafsa/alphabet v1.1.0 -> no
  index drift with the running backend).
- Sources: english/sowpods.txt vendored from kamilmielnik/scrabble-dictionaries;
  russian/scrabble.txt + the dictprep tooling moved out of scrabble-solver.
- CI builds the DAWGs on push/PR and, on a vX.Y.Z tag, packages them flat into
  scrabble-dawg-<tag>.tar.gz and attaches it to the Gitea release.

go.mod

@@ -0,0 +1,13 @@
+module gitea.iliadenisov.ru/developer/scrabble-dictionary
+
+go 1.26.3
+
+require (
+	gitea.iliadenisov.ru/developer/scrabble-solver v1.0.0
+	github.com/iliadenisov/alphabet v1.1.0
+)
+
+require (
+	github.com/iliadenisov/dafsa v1.1.0 // indirect
+	golang.org/x/exp v0.0.0-20201008143054-e3b2a7f2fdc7 // indirect
+)