Proposed Changes

This PR removes hard panics in template loader initialization paths and replaces them with graceful error handling:

• LoadTemplatesWithTags no longer panics when waitgroup creation fails.
• LoadTemplatesWithTags no longer panics when dialers for ExecutionId are missing.
• In both cases, loader logs the error and returns safely instead of crashing the scan process.

Tests

Added regression test:

• TestLoadTemplatesWithTags_NoDialers_NoPanic

Proof:

go test ./pkg/catalog/loader -run 'TestLoadTemplatesWithTags_NoDialers_NoPanic|TestLoadTemplates|TestRemoteTemplates' -count=1
ok  github.com/projectdiscovery/nuclei/v3/pkg/catalog/loader  0.608s

Checklist

• PR targets dev
• Behavior change covered by test
• No panic path now handled gracefully

/claim #6674

Summary by CodeRabbit

• New Features

  • Introduced inline target list expansion for enhanced flexibility in target specification

• Bug Fixes

  • Improved error handling in template loading and profile processing to gracefully handle failures instead of system crashes
  • Enhanced template profile sanitization before configuration merging