docs: update README for wizard, token versions, completion install

README.md

@@ -17,7 +17,8 @@ netssh -p 2222 admin@app-server-03 uptime
 - **Flexible IP resolution** — configurable chain of strategies: management subnet, primary IP, or named interface
 - **Interactive TUI** — fuzzy search with live NetBox queries and 300 ms debouncing (start with `netssh`, no arguments)
 - **Persistent cache** — successful lookups are cached to `~/.cache/netssh/hosts.json` for instant shell completion
-- **Shell completion** — tab-complete hostnames from the cache in zsh, bash, and fish
+- **Setup wizard** — interactive first-run onboarding; re-run anytime with `netssh configure`
+- **Shell completion** — install without sudo via `netssh completion install`
 - **Default SSH user** — set a fallback username once in config instead of typing it every time
 
 ## Installation
@@ -46,12 +47,27 @@ go build -o netssh ./cmd/netssh
 
 ## Configuration
 
-Create `~/.config/netssh.yaml`:
+### Interactive wizard
+
+On first run (when no config exists), `netssh` automatically starts an interactive setup wizard.
+Re-run it at any time to change settings without editing the file manually:
+
+```sh
+netssh configure
+```
+
+The wizard walks through NetBox connection, SSH defaults, resolver strategies, and cache TTL,
+then saves to `~/.config/netssh.yaml`.
+
+### Manual config
+
+`~/.config/netssh.yaml`:
 
 ```yaml
 netbox:
   url: https://netbox.example.com
-  token: your-api-token-here
+  token: nbt_your-api-token-here   # v2 token (nbt_ prefix) recommended
+  token_version: 2                 # auto-detected from token; 1 = legacy, 2 = nbt_
 
 resolver:
   # Strategies are tried in order; the first to return an IP wins.
@@ -73,7 +89,19 @@ ssh:
   default_user: admin  # used when no user is specified on the command line
 ```
 
-Any value can be overridden with environment variables (`NETSSH_NETBOX_URL`, `NETSSH_NETBOX_TOKEN`, etc.) or will be read from the config file.
+Any value can be overridden with environment variables (`NETSSH_NETBOX_URL`, `NETSSH_NETBOX_TOKEN`, etc.).
+
+### API tokens
+
+NetBox supports two token formats:
+
+| Format | Example | Notes |
+|--------|---------|-------|
+| v2 (recommended) | `nbt_abc123…` | Create in NetBox → Admin → API Tokens |
+| v1 (legacy) | `abc123def456…` | Older format; still works, but v2 is preferred |
+
+`netssh` auto-detects the version from the token prefix and stores it as `token_version` in the config.
+A hint is shown during `netssh configure` if a legacy v1 token is entered.
 
 ## Usage
 
@@ -146,28 +174,26 @@ Strategies are tried in the configured order; the first to succeed wins.
 
 ## Shell Completion
 
-### zsh
+Install completion for the current user (no sudo required):
 
 ```sh
-netssh completion zsh > "${fpath[1]}/_netssh"
+netssh completion install             # auto-detects $SHELL
+netssh completion install --shell bash
+netssh completion install --shell zsh
+netssh completion install --shell fish
 ```
 
-Or add to `.zshrc`:
+| Shell | Install path |
+|-------|-------------|
+| bash | `~/.local/share/bash-completion/completions/netssh` |
+| zsh  | `~/.zfunc/_netssh` |
+| fish | `~/.config/fish/completions/netssh.fish` |
+
+For zsh, make sure `~/.zfunc` is in your `fpath` (add to `~/.zshrc`):
 
 ```zsh
-source <(netssh completion zsh)
-```
-
-### bash
-
-```sh
-netssh completion bash > /etc/bash_completion.d/netssh
-```
-
-### fish
-
-```sh
-netssh completion fish > ~/.config/fish/completions/netssh.fish
+fpath=(~/.zfunc $fpath)
+autoload -Uz compinit && compinit
 ```
 
 Completions are served from the local cache — no network request on every `<Tab>`.
@@ -179,12 +205,13 @@ go test ./...        # run all tests
 go build ./...       # build all packages
 ```
 
-The test suite covers the cache, NetBox client (via `httptest`), IP resolver chain, and SSH argument parser.
+The test suite covers the cache, NetBox client (via `httptest`), IP resolver chain, SSH argument parser, config loading, and the setup wizard.
 
 ## How it works
 
-1. `netssh` checks whether the first argument is a known subcommand (`search`, `cache`, `completion`). If not, it enters SSH wrapper mode.
-2. It parses the SSH arguments to extract the destination hostname, handling all flags that consume an extra argument (`-p`, `-i`, `-J`, …).
-3. It checks the local cache. If the entry exists and is within the TTL, it connects immediately.
-4. Otherwise it queries NetBox (`/api/dcim/devices/` and `/api/virtualization/virtual-machines/` in parallel), runs the result through the resolver chain, and caches the IP.
-5. It calls `syscall.Exec` to replace itself with `ssh`, substituting the hostname with the resolved IP.
+1. `netssh` checks whether the first argument is a known subcommand (`configure`, `search`, `cache`, `completion`). If not, it enters SSH wrapper mode.
+2. On first run or when `netbox.url` is empty, the interactive setup wizard starts automatically.
+3. It parses the SSH arguments to extract the destination hostname, handling all flags that consume an extra argument (`-p`, `-i`, `-J`, …).
+4. It checks the local cache. If the entry exists and is within the TTL, it connects immediately.
+5. Otherwise it queries NetBox (`/api/dcim/devices/` and `/api/virtualization/virtual-machines/` in parallel), runs the result through the resolver chain, and caches the IP.
+6. It calls `syscall.Exec` to replace itself with `ssh`, substituting the hostname with the resolved IP.