Applies the functional options pattern established in plugin/singbox to all remaining plugin subdirectories.

Pattern

Each plugin type now follows a consistent structure:

// Unexported struct
type mrs_in struct { ... }

// Constructor with variadic options for programmatic use
func NewMRSIn(action lib.Action, opts ...lib.InputOption) lib.InputConverter

// Option functions
func WithNameAndURI(name, uri string) lib.InputOption
func WithInputDir(dir string) lib.InputOption

// JSON deserialization delegates to constructor
func NewMRSInFromBytes(action lib.Action, data []byte) (lib.InputConverter, error)

Changes

• plugin/mihomo: MRSIn → mrs_in, MRSOut → mrs_out
• plugin/plaintext: TextIn → text_in, TextOut → text_out (+ all extension files: clash, json, surge)
• plugin/maxmind: GeoLite2CountryMMDBIn/Out, GeoLite2ASNCSVIn, GeoLite2CountryCSVIn → unexported equivalents (+ dbip/ipinfo extension files)
• plugin/v2ray: GeoIPDatIn → geoIPDatIn, GeoIPDatOut → geoIPDatOut
• plugin/special: Cutter, Lookup, Private, Stdin, Stdout → unexported equivalents
• lookup.go, merge.go: Replace direct struct literals with constructor calls

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