Add Netwrck, Text-Generator.io, and Codex Infinity

[lee101]

Summary

• Added Netwrck to the Web Apps section -- AI character chat platform with voice, art generation, sharing, and API access.
• Added Text-Generator.io to the Developer Libraries, SDKs, and APIs > Python section -- unified text, vision, and speech API with ChatGPT-compatible endpoints.
• Added Codex Infinity to the Integrations > Terminal section -- autonomous coding agent that runs on bare metal VPS with ChatGPT-compatible API support.

All entries follow the existing formatting conventions of the list.

Test plan

• Entries match the - [Name](url): Description format used throughout the README
• Placed in relevant, existing sections
• Links verified

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