docs: add READMEs for notes-server and filebrowser-server seed dirs

These directories contain TypeScript entity definitions loaded by the
Rust servers at startup. READMEs clarify their purpose and point to
the actual server implementations in crates/apps/.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: pterror

apps/filebrowser-server/README.md

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+# File Browser Server Seeds
+
+TypeScript entity definitions for the File Browser server.
+
+## Contents
+
+- **src/definitions/**: Entity class definitions (EntityBase, System, FileBrowser)
+
+These definitions are loaded by the Rust filebrowser-server at startup to seed the world.
+
+## Server
+
+The actual server is implemented in Rust at `crates/apps/filebrowser-server/`.

apps/notes-server/README.md

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+# Notes Server Seeds
+
+TypeScript entity definitions for the Notes server.
+
+## Contents
+
+- **src/definitions/**: Entity class definitions (EntityBase, System, Notes)
+
+These definitions are loaded by the Rust notes-server at startup to seed the world.
+
+## Server
+
+The actual server is implemented in Rust at `crates/apps/notes-server/`.