ZCode: missing pricing for built-in Z.ai plans #1831

What happened?

I'm seeing missing-pricing warnings for GLM-5.3 and GLM-5.3-Flash
when using ZCode's built-in Z.ai plans. The models and token counts
appear correctly, but their cost estimates stay at $0.00 despite
the rates already being available in the embedded pricing data.

The affected records use provider IDs such as
account:zai-individual-coding-plan and account:zai-start-plan.
The adapter recognizes older built-in IDs but does not recognize
these current plan IDs.

Steps to reproduce

1. Complete a turn using GLM-5.3 or GLM-5.3-Flash in ZCode
   with a built-in Z.ai plan.
2. Run ccusage zcode daily --mode calculate --offline.
3. Observe the missing-pricing warnings and zero cost estimates.

Expected behavior

ccusage should recognize these shared Z.ai plan IDs and calculate
cost estimates using the existing pricing data.

I have a fix ready that covers the four Z.ai account plan IDs.
If broader support is wanted, I can also work on the equivalent
BigModel plans.

I'd also be happy to investigate usage and pricing support for
providers configured through ZCode's OpenRouter or OpenCode Go
templates. I haven't yet verified what usage records those
integrations persist or how their provider IDs map to pricing.

Version

20.0.26