refactor: make SSH additive boolean, add ide=none

SSH is now a standalone `ssh: true/false` value that starts sshd on
port 22 *in addition to* whatever IDE is running, rather than replacing
it. The `ide` value loses the `ssh` option and gains `none` (keep
container alive with no GUI IDE, useful when ssh: true is the only
access method).

- chart/values.yaml: replace `ide: ssh` with `ssh: false` boolean
- chart/templates/deployment.yaml: expose port 22 when ssh=true,
  port 5800 when ide!=none; probes use HTTP (VNC) or TCP socket (SSH-only)
- chart/templates/service.yaml: include both ports when both enabled
- scripts/cont-init-sshd.sh: check SSH=true instead of IDE=ssh
- scripts/startapp.sh: add ide=none case (sleep infinity), drop ssh case
- chart/Chart.yaml: bump to 0.1.6
- README.md: update IDE choice and SSH access docs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

chart/values.yaml

@@ -13,10 +13,13 @@ githubRepo: ""
 # Options:
 #   vscode      — VSCode via VNC browser UI on port 5800 (default)
 #   antigravity — Google Antigravity (VSCode fork) via VNC on port 5800
-#   ssh         — OpenSSH server on port 22 (no VNC GUI)
-#                 Requires SSH_AUTHORIZED_KEYS in the env secret.
+#   none        — no IDE; useful when ssh: true is the sole access method
 ide: vscode
 
+# Start an OpenSSH server on port 22 in addition to the IDE.
+# Set SSH_AUTHORIZED_KEYS in the env secret to allow key-based login.
+ssh: false
+
 # Happy Coder endpoints
 happyServerUrl: "https://happy.farh.net"
 happyWebappUrl: "https://happy-coder.farh.net"