feat(08-02): add 25 GitHub dorks for infrastructure, emerging, enterprise categories

- infrastructure.yaml: 10 dorks covering Tier 5 gateways (OpenRouter,
  LiteLLM, Portkey, Helicone, Cloudflare AI, Vercel AI) and Tier 8
  self-hosted (Ollama, vLLM, LocalAI)
- emerging.yaml: 10 dorks covering Tier 4 Chinese providers (DeepSeek,
  Moonshot, Qwen, Zhipu, MiniMax) and Tier 6 vector DBs (Pinecone,
  Weaviate, Qdrant, Chroma) plus Writer.com
- enterprise.yaml: 5 dorks covering Tier 7 dev tools (Codeium, Tabnine)
  and Tier 9 enterprise (Databricks, Snowflake Cortex, IBM watsonx)
- Registry now loads 50 total GitHub dorks across all 5 categories,
  mirrored in both dorks/github/ and pkg/dorks/definitions/github/

pkg/dorks/definitions/github/enterprise.yaml

@@ -0,0 +1,35 @@
+- id: codeium-envfile
+  name: "Codeium API Key in .env files"
+  source: github
+  category: enterprise
+  query: 'CODEIUM_API_KEY extension:env'
+  description: "Finds Codeium AI coding assistant keys in .env files"
+  tags: [codeium, devtools, env, tier7]
+- id: tabnine-envfile
+  name: "Tabnine Token in .env files"
+  source: github
+  category: enterprise
+  query: 'TABNINE_TOKEN extension:env'
+  description: "Finds Tabnine AI coding assistant tokens in .env files"
+  tags: [tabnine, devtools, env, tier7]
+- id: databricks-envfile
+  name: "Databricks Token in .env files"
+  source: github
+  category: enterprise
+  query: 'DATABRICKS_TOKEN extension:env'
+  description: "Finds Databricks personal access tokens in .env files"
+  tags: [databricks, enterprise, env, tier9]
+- id: snowflake-cortex
+  name: "Snowflake Cortex credentials"
+  source: github
+  category: enterprise
+  query: 'SNOWFLAKE_PASSWORD "cortex"'
+  description: "Finds Snowflake passwords adjacent to Cortex LLM references"
+  tags: [snowflake, cortex, enterprise, tier9]
+- id: watsonx-envfile
+  name: "IBM watsonx API Key in .env files"
+  source: github
+  category: enterprise
+  query: 'WATSONX_APIKEY extension:env'
+  description: "Finds IBM watsonx API keys in .env files"
+  tags: [ibm, watsonx, enterprise, env, tier9]