migrate: stow → chezmoi

- restructure repo to chezmoi conventions (dot_ prefix, private_dot_ssh/)
- add nvim config (was untracked)
- encrypt restic pass.txt with age
- remove stow artifacts (.stow-local-ignore, stow package dirs)
- update bootstrap.sh to use chezmoi apply
- remove runtime files from tracking (micro buffers, zed backup)

dot_config/fastfetch/config.jsonc

@@ -0,0 +1,74 @@
+{
+  "$schema": "https://github.com/fastfetch-cli/fastfetch/raw/master/doc/json_schema.json",
+  "logo": {
+    "type": "small",
+    "position": "left",
+    "printRemaining": false,
+    "padding": {
+      "top": 2,
+      "right": 1
+    }
+  },
+  "display": {
+    "separator": " ",
+    "brightColor": false,
+    "color": {
+      "keys": "blue",
+      "title": "cyan",
+      "separator": "bright_black",
+      "output": "white"
+    },
+    "key": {
+      "width": 3,
+      "type": "icon"
+    },
+    "duration": {
+      "abbreviation": true
+    }
+  },
+  "modules": [
+    "title",
+    "separator",
+    {
+      "type": "os",
+      "key": "os",
+      "format": "{name}"
+    },
+    {
+      "type": "kernel",
+      "key": "kernel",
+      "format": "{release}"
+    },
+    {
+      "type": "uptime",
+      "key": "uptime"
+    },
+    {
+      "type": "command",
+      "key": "age",
+      "shell": "/bin/sh",
+      "param": "-c",
+      "text": "first=\"$(sed -n '1{s/^\\[\\([^]]*\\)\\].*/\\1/p;q}' /var/log/pacman.log)\"; if [ -n \"$first\" ]; then start=\"${first%%+*}\"; now=$(date +%s); then_ts=$(date -d \"$start\" +%s 2>/dev/null || true); if [ -n \"$then_ts\" ]; then days=$(( (now-then_ts)/86400 )); years=$(( days/365 )); rem=$(( days%365 )); if [ \"$years\" -gt 0 ]; then printf '%sy %sd\\n' \"$years\" \"$rem\"; else printf '%sd\\n' \"$days\"; fi; else echo n/a; fi; else echo n/a; fi"
+    },
+    {
+      "type": "shell",
+      "key": "shell",
+      "format": "{pretty-name}"
+    },
+    {
+      "type": "terminal",
+      "key": "term",
+      "format": "{pretty-name}"
+    },
+    {
+      "type": "memory",
+      "key": "ram",
+      "format": "{used}/{total} ({percentage})"
+    },
+    {
+      "type": "disk",
+      "key": "disk",
+      "format": "{size-used}/{size-total} ({size-percentage})"
+    }
+  ]
+}