fix: redirect smartlink directly to CRE when only one is linked

[ghostiee-11]

Fixes #486

Problem

When a smartlinked standard (e.g., /smartlink/standard/CWE/611) resolves to only one connected CRE, the user is taken to an intermediate standard page that just shows the single CRE link. This adds an unnecessary click — the user has to click through to reach the CRE page they actually want.

Changes

1. application/web/web_main.py — Modified the smartlink() function to check the number of linked CREs. When exactly one CRE is linked, it now redirects directly to /cre/{id} instead of the intermediate /node/... page. When multiple CREs are linked, the existing behavior is preserved.

2. application/tests/web_main_test.py — Updated existing test expectations for single-CRE cases (CWE/456 → /cre/222-222, ASVS/v0.1.2 → /cre/333-333) and added a new test case verifying that standards with multiple CRE links still redirect to the standard page.

Testing

• Ran test_smartlink — all assertions pass
• Single CRE case: redirects to /cre/{id} ✅
• Multiple CRE case: redirects to /node/standard/... (unchanged) ✅
• Non-existent standard: redirects to external (e.g., Mitre) ✅
• Unknown standard: returns 404 ✅

AI Disclosure

I used Claude AI to help plan my approach and explore the codebase structure. All implementation, testing, and debugging was done by me.

[Copilot]

Pull request overview

This PR implements a UX improvement for the smartlink feature: when a standard resolves to exactly one linked CRE, the user is redirected directly to the CRE page (/cre/{id}) instead of the intermediate standard node page. When multiple CREs are linked, the existing behavior is preserved.

Changes:

• Modified smartlink() in web_main.py to detect single-CRE cases and redirect directly to /cre/{id}
• Updated existing test assertions for single-CRE cases (CWE/456 and ASVS/v0.1.2) to expect the new redirect target
• Added a new test case to verify that standards with multiple CRE links still redirect to the standard node page

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
application/web/web_main.py	Adds a single-CRE redirect branch in smartlink() before the existing multi-CRE redirect logic
application/tests/web_main_test.py	Updates existing single-CRE test expectations and adds a new multi-CRE regression test

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