feat: preconfigure OpenAI-compatible providers from env vars

Open WebUI already speaks to any OpenAI-compatible endpoint, but reaching
one means an admin knowing the base URL exists and typing it into
Admin > Settings > Connections. Nothing in the product hints that the
endpoint is reachable at all.

Add a small registry of OpenAI-compatible providers Open WebUI ships the
base URL for. Setting a provider's API key env var seeds a ready-to-use
connection on first start; adding another provider is one dict entry.
Melious is the first entry (MELIOUS_API_KEY / MELIOUS_API_BASE_URL), and
its endpoint joins the URL suggestions in the Add Connection modal.

The loader normalizes keys to the URL count the same way
normalize_openai_api_keys does, and skips any base URL already present,
so an explicit OPENAI_API_BASE_URLS entry always wins. With no provider
key set the resulting config is byte-identical to today's default.

Follows the load_oauth_providers() idiom already in config.py.

.env.example

@@ -5,6 +5,10 @@ OLLAMA_BASE_URL='http://localhost:11434'
 OPENAI_API_BASE_URL=''
 OPENAI_API_KEY=''
 
+# Preconfigured OpenAI-compatible providers: setting the key seeds the connection on first start
+# MELIOUS_API_KEY=''
+# MELIOUS_API_BASE_URL='https://api.melious.ai/v1'
+
 # AUTOMATIC1111_BASE_URL="http://localhost:7860"
 
 # For production, you should only need one host as

.webui_secret_key

@@ -0,0 +1 @@
+6zYYvt9FjB3ylojBtc/ovl/cDtWLhQcm

backend/open_webui/config.py

@@ -357,6 +357,58 @@ except Exception:
 OPENAI_API_BASE_URL = 'https://api.openai.com/v1'
 
 
+####################################
+# OPENAI_COMPATIBLE_PROVIDERS
+####################################
+
+# OpenAI-compatible providers Open WebUI ships the base URL for. Setting a provider's API key env
+# var seeds a working connection on first start, so admins don't have to look the endpoint up and
+# type it in. Each entry may be pointed elsewhere with its own base URL env var (self-hosted or
+# regional deployments). Adding another provider is one entry here.
+OPENAI_COMPATIBLE_PROVIDERS = {
+    'melious': {
+        'name': 'Melious',
+        'base_url': 'https://api.melious.ai/v1',
+        'key_env': 'MELIOUS_API_KEY',
+        'base_url_env': 'MELIOUS_API_BASE_URL',
+    },
+}
+
+
+def load_openai_compatible_providers(base_urls: list[str], keys: list[str], api_configs: dict) -> None:
+    """Seed an OpenAI connection for every preconfigured provider whose API key env var is set.
+
+    Mutates the three lists/dicts in place. `base_urls` and `keys` are index-aligned, and
+    `api_configs` is keyed by that index, so keys are first normalized to the URL count the same
+    way `normalize_openai_api_keys` does. A base URL already present is left untouched, so an
+    explicit OPENAI_API_BASE_URLS entry always wins over the preset.
+    """
+    if len(keys) > len(base_urls):
+        del keys[len(base_urls) :]
+    else:
+        keys.extend([''] * (len(base_urls) - len(keys)))
+
+    configured_urls = {url.rstrip('/') for url in base_urls}
+
+    for provider in OPENAI_COMPATIBLE_PROVIDERS.values():
+        key = os.getenv(provider['key_env'], '').strip()
+        if not key:
+            continue
+
+        base_url = (os.getenv(provider['base_url_env'], '').strip() or provider['base_url']).rstrip('/')
+        if base_url in configured_urls:
+            log.info('%s is already configured at %s, skipping preset', provider['name'], base_url)
+            continue
+
+        base_urls.append(base_url)
+        keys.append(key)
+        api_configs[str(len(base_urls) - 1)] = {'enable': True, 'connection_type': 'external'}
+        configured_urls.add(base_url)
+
+
+load_openai_compatible_providers(OPENAI_API_BASE_URLS, OPENAI_API_KEYS, OPENAI_API_CONFIGS)
+
+
 ####################################
 # MODELS
 ####################################

src/lib/components/AddConnectionModal.svelte

@@ -351,6 +351,7 @@
 											<option value="https://api.groq.com/openai/v1" />
 											<option value="https://openrouter.ai/api/v1" />
 											<option value="https://api.x.ai/v1" />
+											<option value="https://api.melious.ai/v1"></option>
 										</datalist>
 									{/if}
 								</div>