Task: [samples]Add Zero False Positive sample project

[Tom-Dynamsoft]

Description

Create a new "Zero False Positive" section in the DBR JS Developer Guide, along with a companion sample project that demonstrates all the necessary settings to eliminate false positive barcode reads in real-world scanning scenarios.

Technical Approach

The guide section should cover:

1. Camera resolution configuration — selecting appropriate resolution to balance speed and accuracy
2. Barcode format limitation — restricting accepted symbologies to reduce false matches
3. Multi-frame validation (3/5 frame confirmation) — requiring a barcode to be read consistently across multiple frames before accepting it as a valid result
4. Result validation — applying string-level checks (length, pattern, checksum) to reject false reads
5. Additional accuracy settings — confidence thresholds, deblur modes, and other relevant SDK parameters

The companion sample project should demonstrate all settings working together in a single, well-documented page.

Definition of Done

• New Dev Guide section written explaining the "Zero False Positive" approach
• Each technique (resolution, format limitation, frame validation, result validation) explained with rationale
• Companion sample project created with all settings integrated
• Sample includes clear code comments explaining each setting's purpose

Notes

• See also: companion docs issue in dynamsoft-docs/barcode-reader-docs-js for the guide content
• The sample project should live in barcode-reader-javascript-samples under a new scenario (e.g., scenarios/zero-false-positive/)

[Tom-Dynamsoft]

Companion docs issue: dynamsoft-docs/barcode-reader-docs-js#496