docs: Add landing page copy, CodeFling listing, FAQ, and comparison sheet

Marketing assets for launch — landing page copy, marketplace description,
FAQ for support load reduction, and competitive comparison table.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/FAQ.md

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+# Corrosion — Frequently Asked Questions
+
+### Do I need to open any firewall ports?
+
+No. All connections are outbound from your server to Corrosion's cloud.
+
+---
+
+### Does Corrosion replace my hosting panel (AMP / Pterodactyl)?
+
+No. Corrosion integrates with them via API or companion agent. Your existing panel remains intact.
+
+---
+
+### What happens if Corrosion goes offline?
+
+Your Rust server continues running normally. Corrosion does not proxy gameplay traffic.
+
+---
+
+### Is my data shared with other servers?
+
+No. All data is isolated by license ID. Multi-tenant database queries are scoped per license.
+
+---
+
+### What if a wipe fails?
+
+Corrosion can automatically retry and optionally roll back using the pre-wipe backup.
+
+---
+
+### Does this work on bare metal?
+
+Yes. Use the Companion Agent (no SSH required after setup).
+
+---
+
+### Can I manage multiple admins?
+
+Yes. Multi-Admin Role-Based Access Control is built in.
+
+---
+
+### Is this beginner friendly?
+
+Yes. If you can install a uMod plugin, you can use Corrosion.
+
+---
+
+### Does this replace Tebex?
+
+Corrosion includes an optional integrated store (Phase 5 roadmap), but does not require Tebex.
+
+---
+
+### How is licensing handled?
+
+One license per server. License validation occurs on plugin startup and periodically.