Add --host flag to control server bind address

[Copilot]

The server hardcoded localhost as its bind address, making it unreachable from outside the local machine — a problem for WSL2 users who need to access the dashboard from a Windows browser.

Changes

• src/server/cli.ts: Added host: string to CLIFlags (default: "localhost"), --host <address> argument parsing with basic character validation, and updated help text with example.
• src/server/index.ts: Passes hostname to the Bun server export. When --host 0.0.0.0, switches CORS to origin: "*" (specific origins are meaningless for an all-interfaces bind); otherwise preserves the existing specific-origin CORS. Startup log normalizes 0.0.0.0 → localhost so the printed URL remains clickable.
• README.md: Documents the new flag in the options table.

Usage

# Bind to all interfaces — reachable from Windows browser via WSL2 IP
ocwatch --host 0.0.0.0

# Bind to a specific interface
ocwatch --host 192.168.1.100

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