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/source_files/9eed3e4cdf5b.txt

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+# =====================
+# GLM / LLM
+# =====================
+GLM_API_KEY=916c5afa2ce9443380593a244c711b86.7ca8xGUh9u1MB3Mu
+GLM_MODEL_NAME=glm-5
+GLM_API_BASE=https://open.bigmodel.cn/api/paas/v4
+GLM_TEMPERATURE=0.4
+GLM_MAX_TOKENS=64000
+
+# =====================
+# Milvus
+# =====================
+MILVUS_HOST=localhost
+MILVUS_PORT=19530
+MILVUS_COLLECTION_NAME=rag_knowledge_base
+MILVUS_USER=
+MILVUS_PASSWORD=
+
+# =====================
+# Embedding / Reranker
+# =====================
+EMBEDDING_MODEL_NAME=./models/bge-small-zh-v1.5
+EMBEDDING_DEVICE=mps
+EMBEDDING_DIMENSION=512
+RERANKER_MODEL_NAME=./models/bge-reranker-base
+RERANKER_TOP_K=5
+
+# =====================
+# Book-aware Splitting
+# =====================
+CHUNK_SIZE=500
+CHUNK_OVERLAP=100
+BOOK_MD_EPUB_CHUNK_SIZE=1000
+BOOK_MD_EPUB_CHUNK_OVERLAP=150
+BOOK_PDF_CHUNK_SIZE=1000
+BOOK_PDF_CHUNK_OVERLAP=100
+BOOK_TXT_CHUNK_SIZE=500
+BOOK_TXT_CHUNK_OVERLAP=100
+
+# =====================
+# Retrieval
+# =====================
+RETRIEVER_TOP_K=10
+SIMILARITY_THRESHOLD=0.3
+
+# =====================
+# Data Directories
+# =====================
+RAW_DATA_DIR=data/raw
+PROCESSED_DATA_DIR=data/processed
+NOTE_UPLOAD_DIR=data/notes
+
+# =====================
+# Metadata / Payload
+# =====================
+DEFAULT_BOOK_DOMAIN=computer_science
+BOOK_PAYLOAD_TYPE=book_content
+NOTE_PAYLOAD_TYPE=personal_note
+
+# =====================
+# Future Partition (reserved)
+# 当前数据量较小，Payload过滤已足够，默认关闭。
+# =====================
+VALID_DOMAINS=computer_science,literature,history,philosophy
+ENABLE_PARTITION=false
+AUTO_MIGRATE_MILVUS_SCHEMA=true
+STRICT_BOOK_METADATA_WRITE=true
+
+# =====================
+# Logging
+# =====================
+LOG_LEVEL=INFO