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)

private_dot_ssh/config.d/20-selfhost.conf

@@ -0,0 +1,38 @@
+# 20 - SelfHost
+Host vps vps-ada
+    HostName 157.22.231.198
+    Port 3422
+    User ada
+    IdentityFile /home/ada/.ssh/id_ed25519_hl
+    ServerAliveInterval 30
+    ServerAliveCountMax 3
+
+Host docker-host
+    HostName 100.70.131.10
+    User ada
+	IdentityFile ~/.ssh/keys/id_ed25519_hl
+	SetEnv TERM=xterm-256color
+    ProxyJump vps
+
+Host pve
+    HostName 100.68.130.76
+    User root
+    IdentityFile ~/.ssh/id_ed25519_hl
+    SetEnv TERM=xterm-256color
+    #    ProxyJump vps
+
+Host openclaw
+    Hostname 192.168.1.20
+    User openclaw
+    IdentityFile ~/.ssh/id_ed25519
+    SetEnv TERM=xterm-256color
+    ProxyJump pve
+
+Host git.ada-dev.ru
+    HostName 100.70.131.10
+    Port 2222
+    User git
+    IdentityFile /home/ada/.ssh/id_ed25519_hl
+    ServerAliveInterval 30
+    ServerAliveCountMax 3
+    ProxyJump vps