docs: add index README and source README snapshots

README.md

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+# Runic Gateway — Documentation
+
+Central documentation for the Runic Gateway platform. The docs here were
+extracted from the two code repositories (with full commit history preserved)
+so they live in one place, independent of either codebase.
+
+## Layout
+
+```
+website/   docs from the shard website (Node/Express + MariaDB + React/Vite)
+link/      docs from the ServUO bridge (C# plugin + Rust sidecar + Node WS)
+```
+
+### `website/`
+| Doc | What it covers |
+|---|---|
+| [BACKEND_DESIGN.md](website/BACKEND_DESIGN.md) | API contract, DB schema, security model |
+| [HERO_EDITOR.md](website/HERO_EDITOR.md) | Hero canvas editor feature spec |
+| [WIKI_UPGRADE.md](website/WIKI_UPGRADE.md) | Wiki subsystem upgrade notes |
+| [website-README.md](website/website-README.md) | Snapshot of the website repo's README (setup/run reference) |
+
+### `link/`
+| Doc | What it covers |
+|---|---|
+| [INTEGRATION.md](link/INTEGRATION.md) | How the website integrates with the uo-link sidecar |
+| [PROTOCOL_2.md](link/PROTOCOL_2.md) | Protocol 2.0 / 2.1 design |
+| [ADMIN_CONTROLS.md](link/ADMIN_CONTROLS.md) | Staff write-plane (kick/ban/broadcast, page queue) |
+| [SHARD_PREREQS.md](link/SHARD_PREREQS.md) | Shard-side prerequisites for the bridge |
+| [PLAN.md](link/PLAN.md) | uo-link build plan |
+| [RESEARCH.md](link/RESEARCH.md) | Research notes |
+| [link-README.md](link/link-README.md) | Snapshot of the link repo's README |
+
+## Provenance
+
+- `website/*` was extracted from `RunicGateway/website` via `git filter-repo`.
+- `link/*` was extracted from `RunicGateway/link` via `git filter-repo`.
+
+Commit history and authorship for each doc are preserved. The two source repos
+retain a short pointer to this repo in their own READMEs; the authoritative copy
+of each document now lives here.