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b3f75232a3
Extract all direct database access into three repository interfaces (SignUserRepo, SignCharacterRepo, SignSessionRepo) matching the pattern established in channelserver. This surfaces 9 previously silenced errors that are now logged with structured context, and makes the sign server testable with mock repos instead of go-sqlmock. Security fix: GetFriends now uses parameterized ANY($1) queries instead of string-concatenated WHERE clauses (SQL injection vector).