feat(server): LAN deployment enhancements — health endpoint, retry, CORS, configurable URLs

[jxufesoft]

Linked Issue

N/A — addresses self-hosted deployment gaps identified during LAN setup.

Description

This PR improves the self-hosted server/ deployment experience for LAN and network-accessible environments:

Core Changes

1. /health endpoint (server/main.py)

   • New GET /health — lightweight liveness & readiness probe with DB check (SELECT 1)
   • No auth required; returns {"status": "ok"|"degraded", "db": true|false}
   • Added to SKIPPED_REQUEST_LOG_PATHS to avoid log noise

2. Transient error retry (server/main.py)

   • _retry_upstream() decorator with linear backoff on POST /memories and POST /search
   • Retries transient codes: provider_timeout, provider_rate_limited, provider_unavailable, datastore_unavailable, vector_store_unavailable
   • Skips retry on permanent client errors

3. Smart CORS (server/main.py)

   • EXTRA_CORS_ORIGINS env var for explicit origin list
   • When AUTH_DISABLED=true, allows * origin so any LAN client can use the API

4. Better error handling (server/main.py)

   • DELETE /memories/{id} returns 404 for invalid/not-found IDs instead of generic 500

5. Configurable docker-compose (server/docker-compose.yaml)

   • DASHBOARD_URL, NEXT_PUBLIC_API_URL, INSTANCE_NAME configurable via env vars
   • PostgreSQL bound to 127.0.0.1:8432 only
   • Local source mount ..:/opt/mem0-src for dev-mode installs
   • mem0 service healthcheck using /health endpoint

6. Global search support (mem0/memory/main.py)

   • Removes mandatory filter requirement from Memory.search() and Memory.get_all()

7. Dashboard fixes (server/dashboard/)

   • Node 22 upgrade, cookie secure flag fix for HTTP LAN access

Type of Change

• New feature (non-breaking change that adds functionality)

Breaking Changes

None — all new behavior is additive and backward-compatible.

Test Coverage

• Tested manually — full Docker Compose stack on LAN with AUTH_DISABLED=true

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• New and existing tests pass locally

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