ci(renovate): Fix renovate config json, enable dependency dashboard & add config linter

[matthewelwell]

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• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Fixes the renovate.json file and enables Renovate's dependency dashboard (at least temporarily to verify the installation is working).

Also adds pre-commit hook to validate configuration to avoid issues in the future.

How did you test this code?

N/a - needs testing once in main

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Jun 1, 2026 11:22am
flagsmith-frontend-preview	Ignored	Preview	Jun 1, 2026 11:22am
flagsmith-frontend-staging	Ignored	Preview	Jun 1, 2026 11:22am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-7657	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7657	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-7657	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7657	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7657	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 37.6 seconds
 30bb871
 🔄 Run: #17134 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 32.6 seconds
 30bb871
 🔄 Run: #17134 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 3 passed

Details

 3 tests across 3 suites
 1 minute, 6 seconds
 30bb871
 🔄 Run: #17134 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 32.1 seconds
 69e43c4
 🔄 Run: #17136 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 41.4 seconds
 69e43c4
 🔄 Run: #17136 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 33.2 seconds
 69e43c4
 🔄 Run: #17136 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 3 passed

Details

 3 tests across 3 suites
 42.3 seconds
 69e43c4
 🔄 Run: #17136 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 39.1 seconds
 72dd6b3
 🔄 Run: #17137 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 41.7 seconds
 72dd6b3
 🔄 Run: #17137 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 51 seconds
 72dd6b3
 🔄 Run: #17137 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 3 passed

Details

 3 tests across 3 suites
 56.8 seconds
 72dd6b3
 🔄 Run: #17137 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 38.8 seconds
 a67c18e
 🔄 Run: #17138 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 38.2 seconds
 a67c18e
 🔄 Run: #17138 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 54.7 seconds
 a67c18e
 🔄 Run: #17138 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 38.3 seconds
 a67c18e
 🔄 Run: #17138 (attempt 1)

[github-actions]

Visual Regression

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