fix(opencode): update test fixture DeepSeek pricing to match official rates

[licat2023]

Issue for this PR

Closes #31150

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Updates the test fixture (\models-api.json) to correct the DeepSeek model pricing that was stale/outdated. The models.dev API currently serves incorrect pricing for DeepSeek V4 models, and this fixture snapshot had the same stale data.

Changes:

Model	Field	Old	New
deepseek-v4-pro	input	1.74	0.435
deepseek-v4-pro	output	3.48	0.87
deepseek-v4-pro	cache_read	0.145	0.003625
deepseek-v4-flash	cache_read	0.028	0.0028
deepseek-chat	cache_read	0.028	0.0028

These values match DeepSeek's official pricing page:

• V4 Flash: input .14, output .28, cache hit .0028
• V4 Pro: input .435, output .87, cache hit .003625

The models.dev source TOML files for V4 models already have correct pricing. This fixture just needed to catch up. A companion PR at anomalyco/models.dev#2037 fixes the remaining deprecated aliases.

How did you verify your code works?

1. Compared all values against DeepSeek's official pricing page (https://api-docs.deepseek.com/quick_start/pricing) - every change matches the published rates
2. Compared against the models.dev source TOML files at anomalyco/models.dev which already contain the correct values
3. Ran \grep\ across the fixture to confirm no other instances of the stale DeepSeek V4 pricing (1.74/3.48/0.145) remain in the deepseek provider section

Screenshots / recordings

N/A - test fixture data change only.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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