chore: initial project structure

CLAUDE.md

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+# Tanabata File Manager
+
+Multi-user, tag-based web file manager for images and video.
+
+## Architecture
+
+Monorepo: `backend/` (Go) + `frontend/` (SvelteKit).
+
+- Backend: Go + Gin + pgx v5 + goose migrations. Clean Architecture.
+- Frontend: SvelteKit SPA + Tailwind CSS + CSS custom properties.
+- DB: PostgreSQL 14+.
+- Auth: JWT Bearer tokens.
+
+## Key documents (read before coding)
+
+- `openapi.yaml` — full REST API specification (36 paths, 58 operations)
+- `docs/GO_PROJECT_STRUCTURE.md` — backend architecture, layer rules, DI pattern
+- `docs/FRONTEND_STRUCTURE.md` — frontend architecture, CSS approach, API client
+- `docs/Описание.md` — product requirements in Russian
+- `backend/migrations/001_init.sql` — database schema (4 schemas, 16 tables)
+
+## Design reference
+
+The `docs/reference/` directory contains the previous Python/Flask version.
+Use its visual design as the basis for the new frontend:
+- Color palette: #312F45 (bg), #9592B5 (accent), #444455 (tag default), #111118 (elevated)
+- Font: Epilogue (variable weight)
+- Dark theme is primary
+- Mobile-first layout with bottom navbar
+- 160×160 thumbnail grid for files
+- Colored tag pills
+- Floating selection bar for multi-select
+
+## Backend commands
+```bash
+cd backend
+go run ./cmd/server          # run dev server
+go test ./...                # run all tests
+```
+
+## Frontend commands
+```bash
+cd frontend
+npm run dev                  # vite dev server
+npm run build                # production build
+npm run generate:types       # regenerate API types from openapi.yaml
+```
+
+## Conventions
+
+- Go: gofmt, no global state, context.Context as first param in all service methods
+- TypeScript: strict mode, named exports
+- SQL: snake_case, all migrations via goose
+- API errors: { code, message, details? }
+- Git: conventional commits (feat:, fix:, docs:, refactor:)