Refactor all plugins to functional options constructors

[Codex]

Refactors plugin implementations under plugin/* to consistently use the functional options pattern, aligned with the latest singbox plugin refactor. Preserves existing config semantics, including required/optional args and mutually-exclusive option relationships derived from the prior new**(action, data) constructors.

• API Shape (All Plugins)

  • Standardize on New* constructors accepting ...lib.InputOption / ...lib.OutputOption
  • Add With* option setters for each plugin’s configurable fields
  • Move JSON config parsing into New*FromBytes(action, data) and wire Register*ConfigCreator to that entrypoint

• Plugins Updated

  • plugin/mihomo: MRSIn, MRSOut
  • plugin/plaintext: text, json, clashRuleSet*, surgeRuleSet (input/output)
  • plugin/special: private, stdin, stdout, lookup, test, cutter
  • plugin/v2ray: GeoIPDatIn, GeoIPDatOut
  • plugin/maxmind: MMDB in/out (MaxMind/DB-IP/IPInfo) + GeoLite2 CSV (country/ASN)

• Option Semantics Preserved

  • Keep the same validation gates and exclusivity rules (e.g. inputDir vs name/uri, JSON jsonPath required, defaults for paths/output dirs/names/extensions).
  • Maintain the existing JSON config keys and their meaning; changes are in constructor structure, not config schema.

Example (new construction style):

in := mihomo.NewMRSIn(
  lib.ActionAdd,
  mihomo.WithMRSNameAndURI("CN", "https://example/cn.mrs"),
  mihomo.WithMRSWantedList([]string{"CN", "US"}),
  mihomo.WithMRSOnlyIPType(lib.IPv6),
)