feat(sanitize): in-place, length-preserving log de-identification

Adds internal/sanitize: rewrites the customer-identifying spans that
internal/privacy detects (domain/FQDN/e-mail/AD/public-IP/timezone) with
same-length neutral fillers, in place, without changing the file format.

- Fillers keep byte length: "sigma.sbrf.ru" -> "xxxxx.xxxx.xx", IP ->
  "00.000.000.00", "Europe/Moscow" -> "Etc/Universal" (same-length valid
  neutral IANA zone), offset "180" -> "000". Timestamps are not recomputed.
- Lossless recursive archive walk (tar/.sds/gz/tgz/zip): entry names, modes,
  and all embedded timestamps preserved; untouched zip entries copied raw;
  member payload length unchanged so tar headers stay byte-identical; only the
  .gz/.zip compression layer is rebuilt. 0 redactions -> byte-identical output.
- privacy.FindSpans is the one matcher shared by detection and redaction;
  fillers are recognised by isRedactionFiller so a re-scan / second pass is a
  no-op. New privacy FPs fixed along the way: syslog selectors (local7.info),
  "MEVersion" firmware quads, *.conf_bak vendor templates, bundled viewer
  domains.
- Binary members (FRU.bin, localtime, redis-dump.rdb, SOL captures) and
  unreadable nested archives are reported in Result.SkippedBinary, never edited.
- Surfaces: POST /api/sanitize (+ GET /api/sanitize/download), the "Обезличить
  и скачать копию" button in the Customer-data panel, and
  logpile -sanitize <file> (restores mtime/atime).

Verified: re-parsing a sanitized Dell TSR / xFusion / Inspur onekeylog / H3C
.sds yields the identical hardware inventory; re-scan is clean. ADL-067,
bible-local/docs/log-sanitization.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/server/server.go

@@ -35,6 +35,7 @@ type Server struct {
 	result         *models.AnalysisResult
 	detectedVendor string
 	rawExport      *RawExportPackage
+	sanitizeResult *sanitizeArtifact
 	convertJobs    map[string]struct{}
 	convertOutput  map[string]ConvertArtifact
 
@@ -89,6 +90,8 @@ func (s *Server) setupRoutes() {
 	s.mux.HandleFunc("GET /api/firmware", s.handleGetFirmware)
 	s.mux.HandleFunc("GET /api/parse-errors", s.handleGetParseErrors)
 	s.mux.HandleFunc("GET /api/privacy-scan", s.handleGetPrivacyScan)
+	s.mux.HandleFunc("POST /api/sanitize", s.handleSanitize)
+	s.mux.HandleFunc("GET /api/sanitize/download", s.handleSanitizeDownload)
 	s.mux.HandleFunc("GET /api/export/csv", s.handleExportCSV)
 	s.mux.HandleFunc("GET /api/export/json", s.handleExportJSON)
 	s.mux.HandleFunc("GET /api/export/reanimator", s.handleExportReanimator)