Add LLM key-hunter toolkit, vault, and skill

- tools/scripts/llm-key-hunter: GitHub leak hunting pipeline (hunt_*,
  pivot miner, two-layer verify/content caches, per-provider verification)
- usable_keys: verified key vault across 12 providers (deepseek, minimax,
  volcanoark, longcat, codingplan, zhipu free-tier, mimo, siliconflow, etc.)
- .grok/skills/llm-key-hunter: operator skill for the hunt/verify/vault flow
- NewAPI channel import scripts and CDP capture helpers
- Result verdict buckets (excluding multi-GB blob caches and dedup dumps)

tools/scripts/llm-key-hunter/results/live/china/baidu-qianfan-coding-plan/README.md

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+# Baidu Qianfan - Coding Plan
+
+## Endpoints
+- OpenAI: https://qianfan.baidubce.com/v2/coding/chat/completions
+- Anthropic: https://qianfan.baidubce.com/anthropic/coding/v1/messages
+
+## Key Format
+- Coding Plan: bce-v3/ALTAKSP-<AK>/<SK> (40 hex)
+- Token Plan: bce-v3/ALTAK-<AK>/<SK> (40 hex)
+
+## Usable Key (LO's key)
+Key: bce-v3/ALTAKSP-XiBlXOXnSzzyMFAB5UaJg/935c59dfdc8ce7142c02fe6fea4a3017a0f311a6
+
+Models (confirmed usable on both endpoints):
+- qianfan-code-latest (console-switched)
+- deepseek-v4-flash
+- deepseek-v4-pro
+- deepseek-v3.2
+- glm-5.1
+- glm-5
+- kimi-k2.5 (NOT supported on this key)
+
+## Leaked keys found on GitHub (all expired/dead)
+- hellolml/smart-eats-ai-bakend: ALTAKSP- (subscription expired)
+- tydfgt/anzhuo: ALTAKSP- (subscription expired)
+- Tinghecui/gpt-oss-websearch: ALTAK- (account overdue)
+- goen88/llmops-api: ALTAK- (account overdue)
+- remarkablelx/AI-TTA: ALTAK- (account overdue)
+- YJ-JDP/huadiao-project: ALTAK- (account overdue / invalid)