BUG: Missing URL format validation in plugin HTTP

[andrinoff]

Describe the bug
Plugin HTTP at plugin/http.go:40-45 only validates URL scheme but not format. Malformed URLs could cause crashes.

To reproduce

1. Plugin calls matcha HTTP with malformed URL
2. Invalid URL passes scheme check
3. Later operations may panic

Expected behavior
Use url.Parse() for full validation before scheme check

Matcha version
master

OS
All

Additional context
File: plugin/http.go lines 40-45
Only checks scheme, missing format validation

[floatpanebot]

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