Add dev-rdiUi feature flag

[ArtemHoruzhenko]

What

Adds a dev-rdiUi feature flag (off by default, SwitchableFlagStrategy) as the first step of the rdi-ui integration. This flag will gate the upcoming new rdi-ui-powered pipeline management flow, rendered for RDI instances above a supported version, while the current management flow stays default for everyone else.

No behavior changes yet — this PR only wires up the flag across backend and frontend:

• features-config.json: dev-rdiUi entry (flag: true, perc: [[0, 0]], filters: []) — off for all real users, but locally overridable.
• Backend: KnownFeatures enum, known-features.ts, and feature-flag.provider.ts (registered with SwitchableFlagStrategy).
• Frontend: FeatureFlags enum, features.ts default state, and an isDevRdiUiEnabledSelector (auto-enabled when running npm run dev:ui locally, mirroring the dev-language pattern).

Testing

• npm run lint and npm run type-check pass.
• Relevant Jest suites pass: redisinsight/ui/src/slices/tests/app/features.spec.ts, redisinsight/api/src/modules/feature/providers/feature-flag/feature-flag.provider.spec.ts, redisinsight/api/src/modules/feature/local.feature.service.spec.ts.
• Manually verified via /api/features that the flag defaults to false with no local override, and that adding {"features": {"dev-rdiUi": true}} to a local config.json override forces it on.

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No ticket yet.

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Note

Low Risk
Additive feature-flag wiring only; defaults keep the flag off in non-dev builds with no routing or RDI UI changes yet.

Overview
Introduces a dev-rdiUi feature flag end-to-end as groundwork for a future rdi-ui pipeline management flow, with no user-facing behavior in this PR.

Config: features-config.json version bumps to 12 and adds dev-rdiUi with perc: [[0, 0]] so it stays off for production users while remaining locally overridable (same pattern as dev-language).

Backend: Registers DevRdiUi in KnownFeatures, known-features.ts, and FeatureFlagProvider with SwitchableFlagStrategy.

Frontend: Adds devRdiUi to FeatureFlags, default flag: false in Redux initial state, and isDevRdiUiEnabledSelector (auto-on when app.env === 'development', otherwise follows /api/features).

^{Reviewed by Cursor Bugbot for commit 1d97176. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

Code Coverage - Backend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	93.21%	16645/17857
🟡	Branches	75.66%	5390/7124
🟢	Functions	87.58%	2552/2914
🟢	Lines	93.07%	15921/17106

Test suite run success

3779 tests passing in 325 suites.

Report generated by 🧪jest coverage report action from 1d97176

[github-actions]

Code Coverage - Frontend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	83.58%	28925/34608
🟡	Branches	69.69%	12320/17678
🟡	Functions	78.63%	7627/9700
🟢	Lines	84.04%	28118/33458

Test suite run success

8085 tests passing in 873 suites.

Report generated by 🧪jest coverage report action from 1d97176

[github-actions]

Code Coverage - Integration Tests

Status	Category	Percentage	Covered / Total
🟡	Statements	79.89%	18452/23094
🟡	Branches	62.19%	8614/13851
🟡	Functions	67.92%	2509/3694
🟡	Lines	79.52%	17382/21858

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