docs: fixes DOC-55

[brad-dow]

Fixes DOC-55

• Replaces all Admin UI screenshots in the user guide to reflect the UI redesign shipped in #3793
• Preserves v1-beta screenshots by moving originals to /img/v1-beta/admin-guide/ and updating all v1-beta image paths, keeping that release's docs frozen and accurate
• Adds two new screenshots: delete-tenant.png and account-settings-recovery.png (first-login state after using an invite link), and splits the previous single account-settings.png into two distinct images for their respective contexts
• A few minor text edits and link fixes
• localenv README tweaks: corrects an invalid pnpm localenv:compose:adminauth:up command, adds missing adminauth commands to the reference table, and adds invite-user instructions for developers who enable auth locally

Checklist

• PR title is prefixed with docs:
• PR title or description includes a fixes #
• You've run pnpm format and pnpm lint
• You've reviewed Vale errors and made changes where appropriate

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[github-actions]

🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 52.17
• Iterations/s: 17.41
• Failed Requests: 0.00% (0 of 3138)

📜 Logs

> performance@1.0.0 run-tests:testenv /home/runner/work/rafiki/rafiki/test/performance
> ./scripts/run-tests.sh -e test -k -q --vus 4 --duration 1m

Cloud Nine GraphQL API is up: http://localhost:3101/graphql
Cloud Nine Wallet Address is up: http://localhost:3100/
Happy Life Bank Address is up: http://localhost:4100/
cloud-nine-wallet-test-backend already set
cloud-nine-wallet-test-auth already set
happy-life-bank-test-backend already set
happy-life-bank-test-auth already set
     data_received..................: 1.1 MB 19 kB/s
     data_sent......................: 2.4 MB 40 kB/s
     http_req_blocked...............: avg=7.68µs  min=1.94µs   med=5.38µs   max=2.82ms   p(90)=6.76µs   p(95)=7.38µs  
     http_req_connecting............: avg=180ns   min=0s       med=0s       max=157.06µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=76.1ms  min=6.13ms   med=61.57ms  max=431.49ms p(90)=129.14ms p(95)=149.2ms 
       { expected_response:true }...: avg=76.1ms  min=6.13ms   med=61.57ms  max=431.49ms p(90)=129.14ms p(95)=149.2ms 
     http_req_failed................: 0.00%  ✓ 0         ✗ 3138
     http_req_receiving.............: avg=83.22µs min=23.54µs  med=72.19µs  max=4.51ms   p(90)=98.66µs  p(95)=121.36µs
     http_req_sending...............: avg=34.87µs min=7.73µs   med=22.92µs  max=2.75ms   p(90)=35.57µs  p(95)=51.05µs 
     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=75.98ms min=6ms      med=61.47ms  max=430.96ms p(90)=128.93ms p(95)=149.1ms 
     http_reqs......................: 3138   52.168957/s
     iteration_duration.............: avg=229.7ms min=149.94ms med=218.27ms max=749.16ms p(90)=284.13ms p(95)=308.77ms
     iterations.....................: 1047   17.406277/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4