Utopia: add normalized schema, data layer, HTTP server and web UI (Phase 1+2)

[CrazyVulcan]

Motivation

• Introduce a normalized, queryable data model and migration path to replace the denormalized legacy payload and to provide a stable persistence boundary.
• Provide a simple developer-facing HTTP server and a minimal browser UI to exercise read/write flows against the new schema.
• Enable deterministic migration/backfill of legacy data and tooling to verify migration integrity.
• Support basic list/board/card operations, tag joins, saved views and drag/drop ordering using numeric position gaps.

Description

• Add SQL migrations db/migrations/001_create_utopia_v2_up.sql and ..._down.sql, seed SQL, and schema.md documenting the ERD and ordering strategy.
• Introduce utopia_data package with db.py, models.py, repositories.py, and services.py to encapsulate DB access and service-level creation helpers.
• Add a small stdlib HTTP server main/server.py with REST endpoints for GET /api/bootstrap, GET /api/boards/:id/state, POST /api/boards, POST /api/boards/:id/columns, POST /api/cards, POST /api/cards/:id/move, POST /api/boards/:id/views, and PATCH /api/cards/:id implementing tag handling, midpoint positioning, and JSON payload normalization.
• Add a minimal single-page web UI under main/static (index.html, app.js, styles.css, domain/adapters.js) wired to the server REST API and using canonical board -> columns -> cards contracts.
• Provide migration and verification tooling: scripts/migrate_utopia_data.py, migrate_utopia_data wrapper, and scripts/verify_utopia_data.py for backup, backfill, and integrity checks.
• Add developer docs and notes: README.md, NOTES.md, and a basic smoke test tests/smoke_phase2.py that exercises end-to-end server + API flows.

Testing

• Executed the smoke script python3 Frontiers/Utopia/tests/smoke_phase2.py which launches the server and exercises board/column/card create, edit, move, tag filtering, and saved view persistence, and it completed successfully.
• No additional unit test suite was included in this rollout beyond the provided end-to-end smoke test.

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Codex Task