Add API docs for network token creation and device provisioning

[FabianoEger]

Summary

• Added API documentation for POST /integration/network/token (Create Network Token) with the new privileges field that controls token capabilities
• Added API documentation for POST /integration/network/device (Create Device using Network) for network-level device provisioning with privilege-gated access
• Added both endpoints to the "Network Token (Network-level)" sidebar category

Companion to tago-io/server#1345.

Files added

File	Purpose
create-network-token.api.mdx	Main doc page for token creation endpoint
create-network-token.RequestSchema.json	Request body schema (name, network, privileges)
create-network-token.StatusCodes.json	Response codes (200, 401)
create-device-using-network.api.mdx	Main doc page for device creation endpoint
create-device-using-network.RequestSchema.json	Request body schema (name, type, connector, tags)
create-device-using-network.StatusCodes.json	Response codes (201, 401)

Test plan

• npm run check passes (oxlint + oxfmt)
• npm run build succeeds with no broken links
• Verify pages render correctly on the dev server (npm run start)
• Confirm sidebar entries appear under "Network Token (Network-level)"