chore: add ROADMAP.md as authoritative future-ideas file

ROADMAP.md

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+# Roadmap
+
+Future implementation ideas for kirche-einfach.
+Ideas live here until they ship (then a `feat:` commit + `[Unreleased]`
+entry in CHANGELOG.md). Keep entries short, ordered by priority.
+
+This file is the **authoritative place** for future ideas.
+`CHANGELOG.md` is historical (what shipped); `AGENTS.md` is rules/architecture.
+
+## Planned
+
+(none yet — add ideas here as they emerge)
+
+## Considered / not started
+
+- **Member form-filling page** — members fill out forms (attendance, sign-up) via the same input schema used by admins to *run* flows.
+- **Approval decision flow** — complete approve/reject-with-reason + member notification for access requests.
+- **E2E tests** — Playwright/Cypress smoke tests across key user journeys.
+- **CI pipeline** — complete Forgejo workflows (backend pytest, frontend build, compose validation, lint).
+- **Audit log** — track who submitted/approved what (church compliance).