llm: remove internal subprocess req and resp types (#9324)

This commit refactors the LLM subsystem by removing internal subprocess
request and response types. It consolidates duplicate type definitions
across the codebase, moving them to centralized locations. The change also
standardizes interfaces between components, simplifies the ServerStatusResp
struct, and moves the ParseDurationMs function to a common package. This
cleanup reduces code duplication between different runner implementations
(llamarunner and ollamarunner).

runner/ollamarunner/cache.go

@@ -107,6 +107,7 @@ func (c *InputCache) LoadCacheSlot(prompt []input.Input, cachePrompt bool) (*Inp
 		return nil, nil, err
 	}
 
+	// TODO (brucemacd): cachePrompt is always true for completion, but false for embedding, can this be improved?
 	if !cachePrompt {
 		numPast = 0
 	}