feat: add web search block functionality and integrate with existing plugins

- Introduced a new web search block plugin to handle web search queries and results.
- Updated copilot, doc block, and pro block plugins to include web search context in AI completions.
- Implemented utility functions for parsing and building web search markdown.
- Enhanced API to support web search requests and responses.
- Added configuration for web search URL and timeout settings.
- Updated size limit checks to account for web search content.

backend/.env.example

@@ -48,6 +48,8 @@ JOB_COMPLETION_CONCURRENCY=2
 JOB_COMPLETION_MAX_QUEUE=16
 JOB_PRO_COMPLETION_CONCURRENCY=1
 JOB_PRO_COMPLETION_MAX_QUEUE=8
+JOB_WEB_SEARCH_CONCURRENCY=1
+JOB_WEB_SEARCH_MAX_QUEUE=4
 JOB_COMPRESS_CONCURRENCY=1
 JOB_COMPRESS_MAX_QUEUE=8
 JOB_OCR_CONCURRENCY=1
@@ -89,16 +91,28 @@ RISK_ENFORCE_REDIS_FAIL_CLOSED=false
 RISK_COMPLETION_MODEL=gpt-4.1-mini
 RISK_PRO_MODEL=gpt-4.1
 RISK_VISION_MODEL=gpt-4.1-mini
+RISK_WEB_SEARCH_MODEL=gpt-4.1-mini
 RISK_COMPLETION_MAX_INPUT_CHARS=24000
 RISK_COMPLETION_MAX_OUTPUT_TOKENS=768
 RISK_COMPLETION_TEMPERATURE=0.4
 RISK_PRO_MAX_INPUT_CHARS=48000
 RISK_PRO_MAX_OUTPUT_TOKENS=2048
 RISK_PRO_TEMPERATURE=0.6
+RISK_WEB_SEARCH_MAX_INPUT_CHARS=128000
+RISK_WEB_SEARCH_MAX_OUTPUT_TOKENS=4096
+RISK_WEB_SEARCH_TEMPERATURE=0.4
 RISK_COMPRESS_MAX_INPUT_CHARS=128000
 RISK_COMPRESS_MAX_OUTPUT_TOKENS=1536
 RISK_OCR_MAX_INPUT_BYTES=10485760
 
+# Web search providers
+SEARXNG_BASE_URL=http://searxng:8080
+SEARXNG_RESULT_LIMIT=10
+FIRECRAWL_BASE_URL=http://firecrawl:3002
+FIRECRAWL_API_KEY=change-me
+WEB_SEARCH_QUERY_COUNT=4
+WEB_SEARCH_SELECTED_URL_LIMIT=10
+
 # Estimated pricing for budget control
 RISK_COMPLETION_INPUT_COST_PER_1K=0.0004
 RISK_COMPLETION_OUTPUT_COST_PER_1K=0.0016