docs: expand roadmap (power, opt-in services, display/UX, control center)

Captures a batch of new roadmap items from a planning pass:
- repo sanitize/organize (incl. the now-redundant console.useXkbConfig /
  boot.initrd.systemd.enable the installer writes, post LUKS-keymap fix)
- laptop power/battery management (PPD-vs-TLP, thermald, charge thresholds)
- opt-in services & integrations (Nextcloud/Syncthing, LM Studio/Ollama,
  containers, Tailscale, Steam/OBS, printing, backups, Flatpak)
- display/monitor management (hotplug profiles, dock story)
- night light (hyprsunset), runtime keyboard-layout switching, swaync DND
- snapshot browse/restore UX, update-awareness indicator
- a "nomarchy" control center + first-boot welcome

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -389,6 +389,82 @@ close · `SUPER+1..9` workspaces · `Print` region screenshot.
   no SSH agent, so no socket contention); screen lock doesn't flush the
   cache. Remaining (optional): a session-level `SSH_AUTH_SOCK` export so GUI
   clients launched outside a shell also see the agent.
+- **Sanitize & organize the repo:** a housekeeping pass for consistency
+  and clarity. Candidate targets (scope still to be defined): prune
+  now-redundant config (e.g. the installer still writes
+  `console.useXkbConfig` / `boot.initrd.systemd.enable` into `system.nix`,
+  which are distro-wide defaults as of the LUKS-keymap fix); reconcile the
+  README option tables with the actual `nomarchy.*` surface; audit
+  comments/docs for drift against the code; and re-check that every file
+  still earns its place under the `modules`/`hosts`/`themes`/`pkgs`/`tools`
+  rule of thumb.
+- **Laptop power / battery management:** today the distro does *no* active
+  power management — only `services.upower` is on, and that's just battery
+  *reporting* for the Waybar widget; CPU/thermal/charge behaviour is whatever
+  the kernel and the nixos-hardware profile default to. Add a real power
+  story behind a `nomarchy.system.power.*` surface, gated to laptops (the
+  installer already detects chassis):
+  - **profiles:** ship `power-profiles-daemon` by default (the upstream-
+    aligned choice — power-saver/balanced/performance via `powerprofilesctl`),
+    with a switcher in the rofi menu and a Waybar indicator. Offer **TLP** as
+    an opt-in for maximum battery life (note: mutually exclusive with PPD, and
+    more aggressive/opaque). **Decision to make:** PPD-default vs TLP-default.
+  - **thermal:** `thermald` on Intel (the Latitude is Intel) to avoid
+    throttling.
+  - **longevity:** battery charge thresholds (e.g. stop charging at ~80%)
+    where the hardware supports it.
+  - **cohere** with `modules/home/idle.nix` (idle lock / display-off /
+    suspend) and review logind lid handling so the power behaviours line up.
+- **Opt-in services & integrations:** the counterpart to the opt-*out*
+  application suite above — heavier or more personal integrations shipped
+  **off by default**, each a `nomarchy.services.<name>.enable` toggle a
+  downstream flips on in one line. Keeps the base lean while making common
+  additions trivial. Candidates by area:
+  - **cloud/sync:** Nextcloud client; Syncthing (`services.syncthing`)
+  - **local AI:** LM Studio (`lmstudio`); Ollama (`services.ollama`, optional
+    GPU accel) — pairs with the menu's Ask-Claude philosophy
+  - **containers/VMs:** Docker/Podman; libvirt + virt-manager
+  - **networking:** Tailscale (`services.tailscale`); WireGuard
+  - **gaming/media:** Steam (`programs.steam`); OBS Studio
+  - **devices:** printing (CUPS + Avahi); KDE Connect / phone integration;
+    OpenRGB
+  - **backup:** restic/borg (`services.restic`)
+  - **escape hatch:** Flatpak (`services.flatpak`) for apps outside nixpkgs
+
+  Decisions: the curated set; whether system services and GUI apps share one
+  surface or split (`nomarchy.services.*` system-side vs home-side packages);
+  and how it relates to `nomarchy.apps.*` (opt-out suite). Unfree entries are
+  already covered (`allowUnfree = true`).
+- **Display / monitor management:** today Hyprland just uses
+  `monitor = ,preferred,auto,1` (mkDefault). Add a real external-monitor/dock
+  story: declarative per-output config, hotplug profiles (kanshi-style, or
+  Hyprland's own monitor rules), and optionally a GUI arranger (nwg-displays
+  writes Hyprland monitor config). Decide declarative-only vs GUI, and the
+  option shape (`nomarchy.monitors` vs plain Hyprland `monitor` lists).
+- **Night light / blue-light filter:** schedulable colour-temperature shift
+  via `hyprsunset` (Hyprland-native; wlsunset/gammastep are alternatives) —
+  sunset/sunrise or a fixed schedule, with a menu + Waybar toggle.
+- **Runtime keyboard-layout switching:** the session layout is a single
+  `nomarchy.keyboard.layout` today. Support a list of layouts with a toggle
+  bind (`hyprctl switchxkblayout` / xkb `grp:` options) and a Waybar
+  indicator for the active layout. Natural follow-on to the LUKS-keymap work
+  — keep the system (console/initrd) and session layouts in sync.
+- **Do-Not-Disturb:** a swaync DND toggle (`swaync-client -dn`) wired into
+  the menu and a Waybar indicator, to silence notifications for
+  presentations/focus.
+- **Snapshot browse/restore UX:** snapper already takes BTRFS timeline
+  snapshots (`nomarchy.system.snapper`); surface them from the desktop — a
+  rofi menu (or btrfs-assistant) to browse/diff/restore and boot-from-
+  snapshot — so rollback isn't CLI-only.
+- **Update awareness:** updates are manual today (`sys-update`/`home-update`);
+  add a Waybar indicator / notification when flake inputs are stale or a new
+  nixpkgs rev is available (optionally with a pending-change count). Augments,
+  never replaces, the explicit rebuild flow.
+- **"nomarchy" control center:** a single TUI/GUI front-end over the common
+  toggles — theme, power profile, opt-in services, display, DND — built on
+  the same `nomarchy-theme-sync` / `nomarchy.*` surface the menu already
+  uses. Plus a first-boot welcome that lands new installs in a guided "pick
+  your theme / essentials" flow (ties into the branding work).
 
 ## Known issues & follow-ups
 - ✓ **Yazi TOML parse error on startup:** yazi 26.x made fetchers'