[Task] Add Zero False Positive section to Developer Guide

[Tom-Dynamsoft]

Description

Add a new "Zero False Positive" section to the Barcode Reader JavaScript Developer Guide. This section should provide comprehensive guidance on configuring the SDK to eliminate false positive barcode reads in production scanning scenarios.

Technical Approach

The documentation should cover the following techniques with explanations and code examples:

1. Camera resolution configuration — how to select resolution for optimal accuracy, trade-offs with performance
2. Barcode format limitation — why restricting accepted symbologies reduces false matches, with configuration examples
3. Multi-frame validation (3/5 frame confirmation) — implementing frame-based result confirmation where a barcode must be read consistently across N out of M frames before being accepted
4. Result validation — applying post-scan validation (string length, regex patterns, checksum verification) to reject false reads
5. Putting it all together — a combined configuration example showing all techniques working in concert

Each technique should include:

• What problem it solves
• How to configure it in the SDK
• Code snippet demonstrating the setting
• Expected impact on accuracy vs. performance

Definition of Done

• New guide section with clear structure and explanations
• Code examples for each technique
• Link to companion sample project in barcode-reader-javascript-samples

Notes

• Companion dev task tracked in Dynamsoft/barcode-reader-javascript-samples for the sample project implementation

[Tom-Dynamsoft]

Companion sample project issue: Dynamsoft/barcode-reader-javascript-samples#289