Improve variable and function naming for code readability

[Copilot]

Renames single-letter and abbreviated variables/parameters to descriptive names across the codebase.

Core utilities

• functions.go: val→inputValue, t→result, f→scaleFactor, x→scaledValue, reqUrl→requestURL
• fs.go: fi→file, fd→fileData, fpath→filePath, dist→destDir, gzf→gzipReader, buf→hashBuffer, b36s→base36String
• serialize.go: a→jsonBytes, dat→decoded, buf→buffer, enc→encoder, dec→decoder
• string.go: rs→runes, lth→runeLength, h→hash, t→sha1Hash, rint→runeInt

Packages

• http/httpclient.go: lk→lock, receiver j→jar, h→httpClient, finded→found
• base62/base62.go: idx→index, c→char
• log/*.go: n→bytesWritten, v→values, a→args, l→logger, s→message
• time/time.go: pt→parsedTime, d→days
• stream/token.go: s→stream

Before:

func Round(val float64, places int) float64 {
    var t float64
    f := math.Pow10(places)
    x := val * f
    // ...
}

After:

func Round(inputValue float64, places int) float64 {
    var result float64
    scaleFactor := math.Pow10(places)
    scaledValue := inputValue * scaleFactor
    // ...
}

Original prompt

Suggest more descriptive variable and function names

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