Fix optionsRaw number formatting and improve JavaScript function support

[Copilot]

This PR resolves an issue where users were having trouble with number formatting in Chart.js tooltips and axis labels when using the optionsRaw() method with JavaScript functions.

Problem

Users reported that their Brazilian Real number formatting wasn't working when using optionsRaw() with JavaScript callback functions:

->optionsRaw('{
    "responsive": true,
    "plugins": {
        "tooltip": {
            "callbacks": {
                "label": function(context) {
                    return "R$ " + context.parsed.y.toLocaleString("pt-BR", {
                        minimumFractionDigits: 2,
                        maximumFractionDigits: 2
                    });
                }
            }
        }
    }
}')

Root Cause

Investigation revealed two issues:

1. Incorrect json_encode() usage: The code was using json_encode($data, true) where true was incorrectly passed as flags parameter
2. Lack of validation and examples: Users needed better guidance on proper optionsRaw() syntax

Solution

Core Fixes

• Fixed json_encode() calls to use proper flags: json_encode($data, JSON_THROW_ON_ERROR)
• Added input validation to optionsRaw() method to catch common formatting errors
• Enhanced error messages for invalid JavaScript object syntax

Documentation & Examples

• Added comprehensive number formatting examples for Brazilian Real (pt-BR) and US Dollar (en-US)
• Created troubleshooting guide in README for common optionsRaw() issues
• Added working Laravel controller examples showing proper implementation
• Documented that both quoted JSON syntax ("responsive": true) and unquoted JavaScript syntax (responsive: true) are valid

Testing

• Created comprehensive test suite covering various optionsRaw() scenarios
• Added browser validation confirming the user's original code works correctly
• Tested edge cases including array inputs, string inputs, and function callbacks

Verification

The user's original code is actually correct and works as expected. Through browser testing, we confirmed that both syntax styles produce proper formatting:

• Tooltip: "Vendas: R$ 1.234,56"
• Y-axis: "R$ 1.234,56"

If users are still experiencing issues, they should check:

1. Browser console for JavaScript errors
2. Chart.js library loading correctly
3. Locale support in their browser
4. Follow the new troubleshooting guide

Fixes #34.

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