Add accounts, presets, live sheet panel and equipment tiles

- Login with registration code, sessions, rate limiting, per-user characters
- Share characters with other users (read-only), admin CLI
- Rules presets with a Presets tab, applied/pending changes with diff in a side sheet
- Equipment as tiles with amounts, starting kit removed
- Rename nav tab to "Character", add "New character" button
- Stop tracking _to_delete/

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJhXuLD2Z6hv3Wqeq9UL9K

.env.example

@@ -0,0 +1,5 @@
+# Copy this file to ".env" (it is ignored by git) and fill it in.
+# The code people must enter to create an account:
+AW_REGISTRATION_CODE=
+# 1 when running behind a reverse proxy that sets X-Forwarded-For / X-Forwarded-Proto / X-Forwarded-Host:
+AW_TRUST_PROXY=0