Handle withattribs for version < 8.0.3

[dantovska]

What

VSIM ... WITHATTRIBS is broken on Redis 8.0.0–8.0.2 (fixed in 8.0.3+). Added a VsimWithAttribs feature flag and made the WITHATTRIBS token optional in the VSIM command/preview/parse helpers.
On unsupported versions, the service omits WITHATTRIBS and back-fills attributes via a single VGETATTR pipeline (one entry per match). The controller, DTOs, request, and response shapes are unchanged.

Testing

1. Connect to Redis 8.0.0–8.0.2 → run a similarity search on a vector set with attributes; verify results include attributes and the preview omits WITHATTRIBS.
2. Connect to Redis ≥ 8.0.3 → verify the canonical single-round-trip path still works and the preview shows WITHATTRIBS.

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Note

Medium Risk
Adds Redis-version-dependent behavior to the VectorSet similarity search path and introduces an additional VGETATTR pipeline fallback, which could impact correctness/performance on affected Redis versions if mishandled.

Overview
VectorSet similarity search is now Redis-version aware for WITHATTRIBS. The service checks a new RedisFeature.VsimWithAttribs (fixed in Redis ≥ 8.0.3), conditionally omits WITHATTRIBS from the VSIM command/preview, and updates reply parsing to support both stride-3 (with attributes) and stride-2 (scores only) responses.

On Redis 8.0.0–8.0.2, the API keeps the response shape stable by back-filling per-match attributes using a single VGETATTR pipeline (swallowing per-element errors). Tests and factories are updated to cover both the canonical path and the fallback behavior, and Redis feature detection is refactored to use a shared version-check helper.

^{Reviewed by Cursor Bugbot for commit fcae09a. Bugbot is set up for automated code reviews on this repo. Configure here.}

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[github-actions]

Code Coverage - Backend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	92.68%	15641/16877
🟡	Branches	74.81%	4928/6587
🟢	Functions	86.75%	2436/2808
🟢	Lines	92.51%	14949/16159

Test suite run success

3439 tests passing in 307 suites.

Report generated by 🧪jest coverage report action from fcae09a

[github-actions]

Code Coverage - Integration Tests

Status	Category	Percentage	Covered / Total
🟡	Statements	79.45%	17537/22071
🟡	Branches	61.86%	8029/12979
🟡	Functions	68%	2431/3575
🟡	Lines	79.02%	16492/20870

[github-actions]

Code Coverage - Frontend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	82.83%	24662/29776
🟡	Branches	68.04%	10358/15223
🟡	Functions	78.01%	6664/8543
🟢	Lines	83.29%	24084/28916

Test suite run success

6976 tests passing in 803 suites.

Report generated by 🧪jest coverage report action from fcae09a