refactor: major architectural restructure for theme-centric organization

Theme System:
- Move all theme app configs to apps/ subdirectory (20 themes)
- Add theme-loader.nix for dynamic theme config deployment
- Simplify stylix.nix to focus on base theming only

Override System:
- Add overrides.nix for file-based config overrides
- Add behavior-configs.nix for non-visual configuration
- Split hypr/nomarchy.conf into behavior vs visual sections

Module Improvements:
- Add lib.mkDefault to all customizable settings
- Add modules/lib/ with shared utilities and state schema
- Update all home and system modules for downstream overridability

Installer:
- New minimal TTY installer (installer/install.sh)
- Golden path: BTRFS + LUKS2 (disko-golden.nix)
- New installer-iso.nix for TTY-only installation
- Keep graphical installer as installerIsoGraphical option

Cleanup:
- Remove obsolete install.sh, disko-ext4.nix, install-nomarchy.sh
- Update live-iso.nix references
- Add .claude/ to .gitignore for local IDE settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/themes/everforest/apps/btop.theme

@@ -0,0 +1,92 @@
+# All graphs and meters can be gradients
+# For single color graphs leave "mid" and "end" variable empty.
+# Use "start" and "end" variables for two color gradient
+# Use "start", "mid" and "end" for three color gradient
+
+# Main background, empty for terminal default, need to be empty if you want transparent background
+theme[main_bg]="#2d353b"
+
+# Main text color
+theme[main_fg]="#d3c6aa"
+
+# Title color for boxes
+theme[title]="#d3c6aa"
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#e67e80"
+
+# Background color of selected items
+theme[selected_bg]="#3d484d"
+
+# Foreground color of selected items
+theme[selected_fg]="#dbbc7f"
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#2d353b"
+
+# Color of text appearing on top of graphs, i.e uptime and current network graph scaling
+theme[graph_text]="#d3c6aa"
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#a7c080"
+
+# Cpu box outline color
+theme[cpu_box]="#3d484d"
+
+# Memory/disks box outline color
+theme[mem_box]="#3d484d"
+
+# Net up/down box outline color
+theme[net_box]="#3d484d"
+
+# Processes box outline color
+theme[proc_box]="#3d484d"
+
+# Box divider line and small boxes line color
+theme[div_line]="#3d484d"
+
+# Temperature graph colors
+theme[temp_start]="#a7c080"
+theme[temp_mid]="#dbbc7f"
+theme[temp_end]="#f85552"
+
+# CPU graph colors
+theme[cpu_start]="#a7c080"
+theme[cpu_mid]="#dbbc7f"
+theme[cpu_end]="#f85552"
+
+# Mem/Disk free meter
+theme[free_start]="#f85552"
+theme[free_mid]="#dbbc7f"
+theme[free_end]="#a7c080"
+
+# Mem/Disk cached meter
+theme[cached_start]="#7fbbb3"
+theme[cached_mid]="#83c092"
+theme[cached_end]="#a7c080"
+
+# Mem/Disk available meter
+theme[available_start]="#f85552"
+theme[available_mid]="#dbbc7f"
+theme[available_end]="#a7c080"
+
+# Mem/Disk used meter
+theme[used_start]="#a7c080"
+theme[used_mid]="#dbbc7f"
+theme[used_end]="#f85552"
+
+# Download graph colors
+theme[download_start]="#a7c080"
+theme[download_mid]="#83c092"
+theme[download_end]="#7fbbb3"
+
+# Upload graph colors
+theme[upload_start]="#dbbc7f"
+theme[upload_mid]="#e69875"
+theme[upload_end]="#e67e80"
+
+# Process box color gradient for threads, mem and cpu usage
+theme[process_start]="#a7c080"
+theme[process_mid]="#e67e80"
+theme[process_end]="#f85552"
+

assets/themes/everforest/apps/neovim.lua

@@ -0,0 +1,10 @@
+return {
+	{ "neanias/everforest-nvim" },
+	{
+		"LazyVim/LazyVim",
+		opts = {
+			colorscheme = "everforest",
+			background = "soft",
+		},
+	},
+}

assets/themes/everforest/apps/vscode.json

@@ -0,0 +1,4 @@
+{
+  "name": "Everforest Dark",
+  "extension": "sainnhe.everforest"
+}