docs: improve REST endpoint (swagger) documentation

[fogx]

our current documentation for the rest endpoints is very sparse. The requests have many (optional) parameters, none of which are actually documented in the API page. Example: https://nowrun.jina.ai/api/v1/text-to-image/docs#/Text-To-Image/index_index_post

What is the host and port? Where do i get the jwt or api_key? tags for what? uris for what? etc.

{
  "host": "localhost",
  "port": 31080,
  "jwt": {},
  "api_key": "string",
  "tags": {},
  "uris": [
    "string"
  ],
  "images": [
    "string"
  ]
}

[fogx]

please also rename the content variable - image: "string" doesn't make sense to me as a user. I would prefer base64_string or something more descriptive. And i would expect this to be the same value in all apis - not "song", "text", "image". What kind of "song"? what kind of "image"?

[fogx]

In fact, I have no direction at all on what needs to be entered, what api_key is, and what uri needs to be, is there such a description please? Or you can operate it and send me the feasible json, maybe I can understand what is going on.

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