fix(project): reject newer panel schema, dedupe alignment ids, sync panel doc versions

[fixcik]

Фоллоуап по замечаниям CodeRabbit на PR #709 (Refs #709):

• Миграции больше не понижают молча будущую схему панели: manifest_from_value и legacy-путь open_project отклоняют panel.schema_version новее поддерживаемой (гейт уровня манифеста уже был) — иначе перезапись контейнера теряла бы поля новой версии.
• effective_alignment_points() без коллизий id: явная точка с id registration-отверстия отбрасывается (побеждает точка от отверстия) + тест.
• UI: инлайновые PanelDoc-литералы в DesignPickerRow.tsx / AddDesignWindow.tsx несли устаревший schema_version: 3 — заменены хелпером newPanelDoc(); фикстуры тестов подняты до v5.
• docs/PROJECT.md: вводный абзац про manifest.panel v4 → v5.

Проверки: cargo test -p cuprum-project (106 ok), cargo clippy --all-targets -D warnings, pnpm test (863 ok), pnpm build.

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⚙️ Run configuration

Configuration used: Repository UI

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Run ID: d5277269-d1fd-4a36-9661-9e2f18d8cd71

📥 Commits

Reviewing files that changed from the base of the PR and between 4ace1d8 and e52e926.

📒 Files selected for processing (8)

• crates/cuprum-project/src/document/migrate.rs
• crates/cuprum-project/src/document/panel.rs
• crates/cuprum-project/src/lib.rs
• cuprum-ui/src/components/project/DesignPickerRow.tsx
• cuprum-ui/src/lib/exposeRequest.test.ts
• cuprum-ui/src/lib/feasibility.test.ts
• cuprum-ui/src/windows/AddDesignWindow.tsx
• docs/PROJECT.md

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