chore: bootstrap solid frontend repo with migration plan

.gitignore

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+node_modules
+dist
+.output
+.env
+.env.*
+.DS_Store

README.md

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+# NXTGAUGE Frontend Solid
+
+SolidStart migration target for `nxtgauge-frontendwebsite`.
+
+## Principle
+Reproduce the same user-facing behavior and runtime-config driven flows without changing product logic.
+
+See `docs/MIGRATION_MASTER_PLAN.md` for the staged plan.

docs/MIGRATION_MASTER_PLAN.md

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+# Frontend Solid Migration Master Plan
+
+## Goal
+Migrate public/product frontend from Next.js to SolidStart with parity-first execution.
+
+## Must-Preserve Flows
+1. Auth and session handling.
+2. Runtime dashboard template loading.
+3. Role intent selection and role switch behavior.
+4. Runtime onboarding renderer (no hardcoded fallback).
+5. Upload validation semantics.
+6. Verification and post-submission status flow.
+
+## Stage Sequence
+1. Build SolidStart shell with routing and layout parity.
+2. Port API proxy layer equivalents for current backend endpoints.
+3. Port runtime-config and dashboard-template client logic.
+4. Port onboarding renderer and all role-specific behavior.
+5. Port dashboard pages module-by-module.
+6. Run parity suite and resolve drift.
+7. Cut over after acceptance.