Summary

• Fix "None" in procedure URLs: run_post_export_sql() now accepts a config parameter from the caller instead of always creating a fresh ExportConfig(load_from_env=True), preventing "None" appearing in curl command URLs when running in local mode without .env files
• DB metadata fallback: Falls back to dictionary_metadata table in the database if BASE_URL is still None
• Safe parameter substitution: substitute_parameters() now skips substitution when a config value is None instead of converting to literal "None" string

Test plan

• Run gooddata-export enrich --db-path <path> in local mode without .env files — verify procedures don't contain None in URLs
• Run gooddata-export export in API mode — verify post-export procedures still work correctly
• Run pytest — all 194 tests pass

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