chore: add plan files and gitignore for MVP feature

plans/mvp-web-app-launcher/CONTEXT.md

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+# Feature Context: Web App Launcher — MVP
+
+## Current State
+Fresh repository — no code yet. Only PLAN_PROMPT.md and .gitignore exist.
+
+## Temporary Workarounds
+- None yet
+
+## Cross-Phase Dependencies
+- Phase 2 depends on Phase 1 (project scaffolding, Prisma setup)
+- Phase 3 depends on Phase 2 (user/group models, auth service)
+- Phase 4 depends on Phase 2 (app model, services layer)
+- Phase 5 depends on Phase 2 (board/section/widget models) and Phase 4 (app widget references apps)
+- Phase 6 depends on Phases 3-5 (admin needs auth, app, board entities)
+- Phase 7 depends on Phase 1 (Tailwind, shadcn-svelte) and Phase 5 (board layout to polish)
+- Phase 8 depends on all prior phases
+
+## Implementation Notes
+- Big Bang strategy: intermediate phases may not build/pass tests. Only Phase 8 must result in a fully working build.
+- SQLite with Prisma — single file DB at `data/launcher.db`
+- All env config via environment variables; `.env.example` provided as template
+- Svelte 5 runes mode: use `$state`, `$derived`, `$effect` — NOT legacy stores for component state
+- shadcn-svelte uses Bits UI primitives — each component is a local file, not a library import