docs: adds workspace-invites feature and tasks

docs/TASKS/workspace-invites/003-frontend-invite-acceptance.md

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+# Task: Frontend Invite Acceptance
+
+## Goal
+
+Build the invite acceptance route and connect it to registration or sign-in.
+
+## Feature Spec
+
+- `docs/FEATURES/workspace-invites.md`
+
+## Scope
+
+- Add a public route for invite acceptance links.
+- Load display-safe invite details from the token.
+- If the user is signed in with the invited email, allow direct acceptance.
+- If the user is signed in with a different email, show a clear mismatch state.
+- If the user is signed out, route them to sign in or register and resume acceptance afterward.
+- Refresh the current user profile after acceptance so the new workspace appears.
+
+## Constraints
+
+- Frontend runtime config must flow through `frontend/src/config.js`.
+- Feature-owned code belongs under `frontend/src/features/workspaces`.
+- Do not add a marketing-style landing page for invite acceptance.
+
+## Likely Files
+
+- `frontend/src/router/router.js`
+- `frontend/src/features/workspaces/`
+- `frontend/src/features/workspaces/stores/workspaceStore.js`
+- `frontend/src/locales/en.json`
+- `frontend/src/locales/fr.json`
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```