win 038f0ee8d3 fix: always sign cch=00000 placeholder and normalize env fingerprints
Two bugs identified from article "Claude Code封号真相":

1. cch=00000 never replaced (fix):
   signBillingHeaderCCH was gated by enableCCH (default false), so the
   cch=00000 placeholder injected by buildBillingAttributionBlockJSON was
   sent to Anthropic as-is — an obvious fake signal. The function already
   guards itself via regex match, so the enableCCH gate is removed.

2. NormalizeSystemPromptEnv was dead code (fix):
   Platform/Shell/OS Version/Working directory fields in user system prompts
   leaked real machine info (e.g. "Darwin 25.3.0", "/Users/win/...") that
   Anthropic could use to correlate requests across accounts. Now normalized
   to canonical values before injecting into the messages pair.
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