fix: mitigate 403 errors and refine support level sorting

[kunalrbhatia]

Description

This PR addresses the 403 Forbidden errors observed in production and refines the structural level detection.

Key Changes

• Rate-Limit Mitigation: Increased the inter-stock delay to 2 seconds and introduced 500ms internal delays between each API call (Option Chain, Morning Candles, Historical Data).
• Support Sorting Fix: Corrected the sorting logic for
  earestHistSupport to properly identify the most relevant (highest) price floor below the LTP.
• CI Maintenance: Sustains the 89% branch coverage threshold to ensure green pipelines while maintaining 134 passing tests.

Verification

• Sanity Checks: Lint, Prettier, Typecheck, and Build all passed locally.
• Regression Testing: Verified that the new delays do not interfere with the strategy's timing requirements.