docs: add Winston logging refactor design spec

Design for migrating from Pino to Winston with hybrid console/file logging,
npm-standard log levels, and dependency cleanup.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitmodules

@@ -5,3 +5,12 @@
 [submodule "vendor/discord-video-stream"]
 	path = vendor/discord-video-stream
 	url = https://github.com/dank074/discord-video-stream.git
+[submodule "vendor/drizzle-orm"]
+	path = vendor/drizzle-orm
+	url = https://github.com/drizzle-team/drizzle-orm.git
+[submodule "vendor/better-sqlite3"]
+	path = vendor/better-sqlite3
+	url = https://github.com/WiseLibs/better-sqlite3.git
+[submodule "vendor/node-datachannel"]
+	path = vendor/node-datachannel
+	url = https://github.com/Discord-RE/node-datachannel.git