Initial global Obsidian config

Shared config extracted from obsidian-config; vault-specific files (bookmarks.json, daily-notes.json) excluded.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Claude-Session: https://claude.ai/code/session_01ASYabtTgxSxJPjxPmBK9PJ

community-plugins.json

@@ -0,0 +1,7 @@
+[
+  "obsidian-minimal-settings",
+  "obsidian-hider",
+  "calendar",
+  "multi-vault-links",
+  "typewriter-mode"
+]