feat: initial implementation — all 35 requirements across phases 1-3

Backend (Spring Boot 3.2 / Java 21 / PostgreSQL):
- JWT auth with BCrypt password hashing
- User profile + Mifflin-St Jeor BMR calculator
- Food search + barcode via OpenFoodFacts API with local cache
- Meal CRUD with user data isolation and ownership checks
- AI photo analysis (OpenAI Vision) with confidence intervals
- AI correction feedback loop for personalisation
- Flyway DB migrations + RFC-7807 error responses

Mobile (React Native / TypeScript):
- Full navigation stack (Auth → Tabs → Home stack)
- Design tokens (WCAG 2.2 AA colours, 8px grid, 48px touch targets)
- 10 screens: Login, Register, Home, Search, Camera, AI Result, Edit Meal,
  Daily Details, History, Profile
- Confidence-aware calorie display (kcal ± range)
- Repeat last meal shortcut + macro tracking

Docs:
- docs/PLAN-AND-REQUIREMENTS.md
- docs/traceability.csv (35 requirements, all Implemented)

.github/skills/README.md

@@ -0,0 +1,16 @@
+# Virsaitis Skills
+
+This directory contains Copilot skill definitions for your project.
+
+## What are Skills?
+
+Skills provide specialized capabilities, domain knowledge, and refined workflows.
+Each skill folder contains a `SKILL.md` file with tested instructions for specific domains.
+
+## Creating a Skill
+
+1. Create a new folder under `.github/skills/`
+2. Add a `SKILL.md` file with frontmatter and instructions
+3. Reference the skill in your agent or instructions
+
+See the [Skills Standards](../copilot-modules/skills-standards.md) module for full details.