Feat 3139 self hosted multi regions support

[ibaraki-douji]

What does this PR do?

Adds self-hosted multi-region console support so operators can run one apex console against a meta API plus regional APIs, without Cloud-only gates or rebuilding the image when regions change.

• isMultiRegion from PUBLIC_APPWRITE_MULTI_REGION=true (alongside existing isMultiRegionSupported for Cloud).
• Runtime region catalog via GET /console/regions (nginx exact location + optional ConfigMap/volume mount). Accepts a JSON array or { "regions": [...] } with $id, name, disabled, available, optional flag, and optional routing fields:
  • hostname → {page-protocol}//{hostname}/v1
  • endpoint → full API base (with or without /v1)
• Self-hosted API routing (not Cloud subdomain rewrite):
  • single-region / meta: same hostname as the page + /v1 (leave PUBLIC_APPWRITE_ENDPOINT empty)
  • multi-region regional calls: only catalog hostname / endpoint
  • Cloud: unchanged {region}. subdomain behavior
• Create + onboarding: show region picker and send region when multi-region is on (self-hosted modal, not Cloud wizard).
• Org UI: show region name on project cards when multi-region is enabled.
• getProjectEndpoint: uses getApiEndpoint(region) so copy/display URLs match SDK routing.
• Unit tests: src/lib/helpers/regionHosts.test.ts for endpoint vs hostname vs null fallback.
• .env.example: documents empty PUBLIC_APPWRITE_ENDPOINT for self-hosted (no hostname baked into the image).

Self-hosted operators configure hosts at deploy time via /console/regions; they do not need to rebuild the console image per environment.

Test Plan

• bun format / bun run check / bun run lint / bun run test:unit -- src/lib/helpers/regionHosts.test.ts
• Confirm built image has no baked appwrite.localhost / fra.localhost / nyc.localhost / absolute http://…localhost/v1 (empty PUBLIC_APPWRITE_ENDPOINT)
• Single-region SH: PUBLIC_APPWRITE_MULTI_REGION=false, console on localhost → API calls go to http://localhost/v1; register/login works
• Multi-region SH: PUBLIC_APPWRITE_MULTI_REGION=true + ConfigMap at /console/regions with hostname → region picker, create project in fra/nyc, SDK hits regional hosts; meta stays on page hostname
• Cloud path unchanged when PUBLIC_CONSOLE_MODE=cloud (subdomain rewrite still applies)

Related PRs and Issues

• Closes 🚀 Feature: Self-hosted multi-region console (region picker + runtime regions catalog) #3139
• Related backend: 🚀 Feature: First-class self-hosted multi-region (meta + regional APIs) appwrite#12964 / Feat 12964 self hosted multi regions support appwrite#12965

Checklist

• Have you read the Contributing Guidelines?
• Branch follows TYPE-ISSUE_ID-DESCRIPTION (feat-3139-self-hosted-multi-regions-support)

[greptile-apps]

Greptile Summary

The PR adds runtime-configurable multi-region support for self-hosted consoles while preserving Cloud routing.

• Loads and validates a same-origin runtime region catalog before regional SDK calls.
• Routes regional API and displayed project endpoints through catalog-provided hosts.
• Adds self-hosted region selection to project creation and region labels to project cards.
• Uses the current page origin for self-hosted API calls when no explicit endpoint is configured.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/routes/(console)/regions.ts	Adds validated, cached runtime catalog loading with propagated failures and retry support.
src/routes/(console)/+layout.ts	Ensures self-hosted region routing data is initialized before descendant console loads.
src/lib/helpers/apiEndpoint.ts	Separates catalog-based self-hosted routing from existing Cloud subdomain routing.
src/lib/helpers/regionHosts.ts	Introduces the in-memory region-to-endpoint catalog used by SDK endpoint resolution.
src/routes/(console)/organization-[organization]/createProject.svelte	Adds self-hosted regional project selection and includes the selected region in creation requests.
.env.example	Changes the self-hosted endpoint default to use same-origin runtime resolution.

_{Reviews (5): Last reviewed commit: "chore(env): Revert PUBLIC_APPWRITE_ENDPO..." | Re-trigger Greptile}