Refactor WASM guard detection placement and inline config validation log wrappers

[Copilot]

Semantic clustering surfaced two low-risk refactors: WASM guard auto-detection lived in cmd/proxy.go instead of the WASM cache module, and config/validation.go used one-line private logging wrappers that obscured validation flow. This PR tightens cohesion in internal/cmd and simplifies config validation control flow without behavior changes.

• WASM setup cohesion (internal/cmd)

  • Moved containerGuardWasmPath and detectGuardWasm() from internal/cmd/proxy.go to internal/cmd/wasm_cache.go.
  • Kept newProxyCmd() behavior unchanged (defaultGuard := detectGuardWasm()), but colocated guard-path detection with other WASM cache/bootstrap logic.

• Validation flow simplification (internal/config)

  • Removed private wrappers:
    • logValidateServerStart
    • logValidateServerPassed
    • logValidateServerFailed
  • Inlined equivalent logValidation.Printf(...) calls at usage sites in server/auth/containerization validation paths to make control flow directly readable.

• Illustrative change

  // before
  logValidateServerFailed(name, server.Type, "HTTP server missing url field")
  
  // after
  logValidation.Printf("Validation failed: %s, name=%s, type=%s",
      "HTTP server missing url field", name, server.Type)

[Copilot]

Pull request overview

This PR performs low-risk refactoring to improve cohesion around WASM guard detection and simplify config validation logging without changing validation behavior.

Changes:

• Moved baked-in WASM guard path detection from proxy command code into the WASM cache module.
• Removed private validation log wrapper helpers and inlined equivalent logValidation.Printf calls.
• Kept proxy command guard defaulting behavior intact via detectGuardWasm().

Show a summary per file

File	Description
internal/cmd/wasm_cache.go	Adds colocated baked-in guard path constant and detection helper.
internal/cmd/proxy.go	Removes guard detection helper now provided by the WASM cache module.
internal/config/validation.go	Inlines validation logging calls and removes wrapper helpers.

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• Files reviewed: 3/3 changed files
• Comments generated: 0