Add template search command

[m-abdelwahab]

Summary

Adds a new railway templates search command backed by the Railway API templateSearch query.

The command supports an interactive TTY picker for humans, with a minimal command-palette-style search experience, while also supporting non-interactive usage through plain output and --json for agents or scripts. It includes pagination, category, verification, and limit flags, and uses the public GraphQL client so template search does not require login.

railway templates search --help
Search published templates

Usage: railway templates search [OPTIONS] [QUERY]

Arguments:
  [QUERY]  Search term. Seeds the picker in TTY mode

Options:
      --json                 Print the GraphQL response shape as JSON
      --limit <LIMIT>        Number of results to request [default: 20]
      --after <AFTER>        Fetch the next page using pageInfo.endCursor
      --category <CATEGORY>  Filter by template category
      --verified <VERIFIED>  Filter by verification state [possible values: true, false]
  -h, --help                 Print help
  -V, --version              Print version

Demo

template.search.in.CLI.mp4