feat(go/M2.1): port czech.Normalize — NFKD + Mn strip + lowercase
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Adds internal/domain/czech.Normalize, the first pure-domain function in the Go rewrite (M2 milestone). Matches Python czech_utils.normalize byte- for-byte: NFKD decompose via golang.org/x/text/unicode/norm, drop Mn- category combining marks (unicode.Mn, not IsMark, to match Python's unicodedata.combining() semantics), then strings.ToLower. Includes 13-case table-driven test; all inputs spot-checked against the Python implementation before locking. Adds golang.org/x/text v0.36.0 as first external dependency. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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