address_verify

• Bump dependencies to latest majors: file_picker ^11.0.0, geolocator ^14.0.0, geocoding ^4.0.0, and google_mlkit_text_recognition ^0.15.0.
• Migrate to file_picker 11's static FilePicker.pickFiles API (replaces the removed FilePicker.platform accessor). No public API changes; behavior is unchanged.

First feature-complete release of address_verify.

• Headless AddressVerifyEngine with the full pre-screening pipeline: validate -> OCR -> address/name match -> location cross-reference -> weighted signal fusion -> packaged result.
• AddressVerifyConfig exposes developer-defined document types, signal toggles, weights, OCR language, return mode, and theme.
• Confidence fusion re-normalizes over present signals only, with a per-signal ConfidenceBreakdown returned alongside every result.
• Pure-Dart AddressMatcher and NameMatcher with normalization, bidirectional abbreviation handling, Jaccard overlap, and critical-token scoring.
• File handling supports PDF, PNG, and JPG with size and format guards; PDFs are rasterized via pdfx (up to 3 pages when the first is sparse).
• Default OCR provider backed by google_mlkit_text_recognition; callers can inject their own via OcrProvider.
• Optional GPS country cross-reference via geolocator + geocoding, including a mockedLocation advisory flag.
• Themeable AddressVerifyWidget covering doc-type select, upload, address form, and submit, plus a runnable example/ app wiring every option.
• Honest-naming gate, golden matcher cases (including Nigerian/African address formats), and a full unit + widget test suite.