[feat]: Router in API with model opennsfw2 and nsfw-detector

[Cryptoverso]

feat: add NSFW detection models (nsfw-detector and OpenNSFW2)

• Added the nsfw_mobilenet2.224x224.h5 model to apps/pyserver/app/nsfw_model/, used for detecting NSFW (Not Safe for Work) content.
• Integrated OpenNSFW2 model from UOL to enhance detection accuracy.
• These models classify images into categories such as: porn, hentai, drawings, sexy, and neutral.

Example output:
{
"/tmp/tmp.jpg": {
"drawings": 0.0057,
"hentai": 0.0006,
"neutral": 0.3629,
"porn": 0.0116,
"sexy": 0.6192
}
}

• Models align with the detection logic of https://nsfwjs.com.
• Updated existing object detection endpoints under the /oracle route instead of the default path.