Rebuild: Minor Dockerfile cleanup

Fix: Match working SearXNG Docker config from reference

Fix: Use default SearXNG port 8080 configuration

Fix: Set GRANIAN_PORT=7860 for HF Spaces compatibility

Fix: Change app_port to 7860 for HF Spaces compatibility

Fix: Change port to 7860 for HF Spaces compatibility

Configure SearXNG for API usage with JSON support

Fix: Add missing FROM instruction to Dockerfile

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initial commit