fix: add safe casting and complete param binding for ChatOllamaComponent

[YamonBot]

• Introduce safe_cast for all numeric fields to avoid runtime errors from blank or invalid inputs.
• Fully bind new and existing Ollama API parameters (e.g., temperature, top_k, tfs_z, repeat_penalty, frequency_penalty).
• Expose keep_alive_mode/value/unit so users can extend model memory retention beyond the previous short default—enabling faster warm-starts and lower latency.
• Reflect several new parameters from the latest Ollama API for more granular control (e.g., num_ctx, num_gpu, num_thread).

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #8228 will degrade performances by 17.07%

_{Comparing YamonBot:patch-4 (e38c547) with main (a0c00c0)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 17 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_cancel_build_success	255.1 ms	220.4 ms	+15.76%
❌	test_cancel_nonexistent_build	8.2 ms	9.8 ms	-17.07%

[YamonBot]

Oh no, I committed without realizing there was a branching issue.

This suggestion applies only to the following file:

src/backend/base/langflow/components/models/ollama.py