init: pre-launch master checklist

MANAGEMENT/PRE_LAUNCH_CHECKLIST.md

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+# ZLH Pre-Launch Master Checklist
+
+Last updated: 2026-03-09
+Status: **In Progress**
+
+---
+
+## Core Platform
+
+- [ ] Upload pipeline stability (gate item — solidify before anything else)
+- [ ] Console final check (functionality + UX polish)
+- [ ] Stress testing (load, concurrent containers, edge cases)
+
+---
+
+## Frontend / Site
+
+- [ ] Site copy rewriting (landing page, pricing page, marketing copy)
+
+---
+
+## Billing
+
+- [ ] Reimplement billing structure (based on Pterodactyl model — should be fast)
+
+---
+
+## Dev Containers
+
+- [ ] Finalize dev container setup
+- [ ] Usability pass (workflow, friction points)
+- [ ] Mod grab feature — allow devs to pull mods from a game container
+
+---
+
+## Deferred / Open Threads
+
+See open issues for items deferred from the agent build:
+- code-server systemd + Traefik routing (issues #2, #3)
+- Payload sizing and spec presets (issue #1)
+
+---
+
+## Notes
+
+- Two active dev days per week — take it in stride, no scope creep
+- Billing is not a long task, do not block other work on it
+- Upload pipeline stability is the gate — everything else follows