⚡ Bolt: Extract inline regexp.MustCompile statements for performance

[lleontor705]

💡 What: Extracted several inline regexp.MustCompile statements to package-level variables in internal/mcp/tools_memory.go and internal/migration/migration.go.

🎯 Why: Compiling regular expressions using regexp.MustCompile inside functions incurs significant performance penalties due to memory allocation and state machine parsing happening on every call. Moving these to the package level ensures the regular expressions are parsed only once during application startup.

📊 Impact: Reduces per-call overhead and heap allocations for the affected functions, eliminating redundant CPU cycles particularly when these functions are called frequently or within loops (e.g., extractLearnings).

🔬 Measurement: Verify with go test -bench . -benchmem ./... - CPU operations and allocations should reflect an overall application improvement since regex parsing is avoided at runtime.

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PR created automatically by Jules for task 3354595088798176420 started by @lleontor705

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