shell migration: fish -> mksh, reorganize bin/, wallpaper cleanup

- replace fish config with .profile (POSIX login) and .mkshrc (interactive)
- organize .local/bin into subdirs: academic, cron, dev, dmenu, history,
  media, misc, monitoring, nnn, security, statusbar, system
- all subdirs added to PATH, scripts callable by name from anywhere
- remove fish config, .config/shell/aliasrc, .config/shell/profile
- consolidate sb-* scripts into statusbar/ (updated stale copies)
- convert wallpapers to webp, slug-WxH naming scheme
- regenerate plan9 solid fills at proper monitor dimensions
- fix larbs -> lazykris path refs across scripts
- remove remapd from both xprofile files
- fix bashism shebangs (11 scripts: #!/bin/sh -> #!/bin/bash)
- update bm-dirs/bm-files for current home layout
- update emoji set to Unicode 15.0 (3655 entries)
- merge push + push-smart into single script with --smart flag
- delete one-off scripts, convert trivial wrappers to aliases

add ram memory visualization script

add bad-apple and cirno fastfetch presets, update glenda ascii art, update ff function

add feedsync fish function for opml-to-sfeedrc sync

add bm bookmark manager and dsnip launcher

update nvim plan9 theme, add hosts file, misc updates

- Port vacme colorscheme to plan9 with LazyVim extensions
- Add colorscheme switcher keymaps (plan9, acme, base16, catppuccin, tokyonight)
- Add StevenBlack-based hosts file (173K lines: ads, malware, tracking, gambling, porn)
- Add dkymap and webdev scripts, remove zed
- Minor fish config and picom updates

add 10 scripts, remove remapd/remaps

New: dllm, dlog, email, lfub, sb-systemstats, shred, sort, trash, vroid, ytcomments
Removed: remapd, remaps (banned — caused Xorg CPU spikes)

add vivaldi config (preferences + bookmarks)

Initial commit: dotfiles from lazykris

Full rice config for Arch Linux with dwm — fish, nvim, tmux, eww,
dunst, picom, mpd/ncmpcpp, newsboat, 145+ scripts, statusbar
modules, and machine profiles structure.