Fix start-proxy.js flag-parse crash (standalone --mode/--port)

[redact22]

Why

Part of the $20-plan downgrade prep. redact22/deepclaude is the simpler public sibling of the hydra deepclaude; the owner runs deepclaude and shouldn't hit a crash whichever copy launches.

The bug

proxy/start-proxy.js read argv[2]/argv[3] as the legacy <url> <key> positionals before checking for flags, so node start-proxy.js --mode deepseek --port 3200 was treated as legacy mode with targetUrl = "--mode" → new URL('--mode') crash. Standalone flag mode was unreachable.

Fix

Only treat the first two args as url/key when they are not flags (startsWith('-')). Legacy mode (deepclaude.sh/ps1 passing a real url + key) is unchanged. Verified: standalone --mode/--port now starts and listens; legacy still works.

This is the same fix already applied in the hydra deepclaude (PR aattaran#9). The hydra copy is the canonical, full-featured one; this keeps the sibling from crashing in standalone mode.

https://claude.ai/code/session_01QudvzQk8mSQd3xrQwmX93D

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