feat: implement label standards support (GS1, UDI, VDA, GHS)

[productdevbook]

Summary

Implement industry label standard templates and helpers for GS1, healthcare UDI, automotive VDA/AIAG, food, chemical GHS, and more.

Research Findings

GS1 Standards

• GS1-128: Code 128 + FNC1 + Application Identifiers. SSCC shipping labels (AI 00)
• GS1 DataBar: 7 variants for POS/variable-measure items (ISO/IEC 24724)
• GS1 DataMatrix: DataMatrix ECC 200 + FNC1 prefix (healthcare, pharma)
• GS1 Digital Link: GS1 IDs as URIs in QR/DataMatrix (`https://id.gs1.org/01/GTIN/10/LOT\`)
• 160+ Application Identifiers: AI(00)=SSCC, AI(01)=GTIN, AI(10)=Batch, AI(17)=Expiry, AI(21)=Serial, AI(310n)=Weight, AI(410)=Ship-to GLN, AI(420)=Ship-to postal, etc.

Industry Templates

Shipping: GS1 Logistic Label (3-zone, 100x150mm), UPS MaxiCode, FedEx PDF417, carrier labels
Healthcare: UDI (FDA/EU MDR), HIBC, ISBT 128 (blood), EU FMD pharma serialization
Automotive: AIAG B-1 (4"x6"), VDA 4902 (A5, 9 fields), VDA 4992 (KLT A7), Odette
Food: GS1 DataBar for variable-measure, nutrition facts layout helpers
Chemical: GHS labels with pictograms, H/P-codes, signal words, supplier info
Textile: ISO 3758 care symbols, fiber content
Electronics: CE/WEEE/RoHS/energy label combinations

Regulatory Requirements

• EU FMD: GTIN + Serial + Batch + Expiry in GS1 DataMatrix
• US DSCSA: NDC/GTIN + Serial + Lot + Expiry
• US FDA UDI: DI + PI (lot, serial, dates) in GS1 DataMatrix or GS1-128
• Russia CRPT: DataMatrix with crypto-tail
• Turkey ITS, India DGFT, Brazil ANVISA, Saudi SFDA: All require GS1 DataMatrix serialization

Check Digits & Validation

• GS1 check digit (Mod 10 weighted)
• GTIN-8/12/13/14 validation
• SSCC generation
• GLN validation
• HIBC check character
• AI format validation (fixed vs variable length, FNC1 separators)

Barcode Quality Standards

• ISO/IEC 15416 (1D quality grading A-F)
• ISO/IEC 15415 (2D quality grading)
• Minimum X-dimensions per application

Tasks

• Implement GS1 Application Identifier database (160+ AIs with validation)
• Implement GS1 check digit calculator
• Implement GTIN/SSCC/GLN validation and generation
• Implement GS1-128 data formatter (FNC1 + AI encoding)
• Implement GS1 DataMatrix data formatter
• Implement GS1 Digital Link URI builder/parser
• Implement GS1 Logistic Label template (3-zone shipping label)
• Implement VDA 4902 transport label template (9-field A5)
• Implement AIAG B-1 shipping label template
• Implement UDI label helper (FDA/EU MDR format)
• Implement HIBC encoding
• Implement EU FMD data formatter
• Implement GHS label template (pictograms, H/P-codes)
• Write comprehensive tests with real-world GS1 data examples