⚡ perf(anthropic): pre-allocate slice capacity in assistantMessageParam

[matdev83]

💡 What:
Pre-allocated the blocks slice capacity based on the length of m.Parts in assistantMessageParam within internal/plugins/backends/protocols/anthropicmessages/invoke.go.

🎯 Why:
When iterating over m.Parts and conditionally appending items to an uninitialized slice, the Go runtime might reallocate the underlying array multiple times as the length grows. Pre-allocating the capacity avoids these reallocations, saving CPU cycles and reducing memory allocations.

📊 Measured Improvement:
Before the optimization:

BenchmarkAssistantMessageParam-4        574483          2009 ns/op        2992 B/op          9 allocs/op

After the optimization:

BenchmarkAssistantMessageParam-4       1000000          1042 ns/op        1408 B/op          6 allocs/op

• Execution time reduced from ~2009 ns/op to ~1042 ns/op (nearly a ~48% improvement).
• Allocations reduced from 9 allocs/op to 6 allocs/op.
• Memory allocated per operation reduced from 2992 B/op to 1408 B/op.

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PR created automatically by Jules for task 4428547483559643442 started by @matdev83

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📥 Commits

Reviewing files that changed from the base of the PR and between 02325fe and 4578000.

📒 Files selected for processing (1)

• internal/plugins/backends/protocols/anthropicmessages/invoke.go

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