fix: correct common typos in messages (unkown→unknown, occured→occurr…

[coonghe03]

This PR fixes multiple spelling mistakes found across the codebase/log/diagnostic strings.

Changes:

• unkown → unknown
• occured → occurred (fixed 11 occurrences)
• retun → return
• paramter → parameter

No functional behavior changes; text-only corrections to improve developer/user-facing messages and diagnostics.

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