chore: move rust provider registry into core

litellm-rust/ADDING_A_PROVIDER.md

@@ -1,7 +1,7 @@
 # Adding a provider / route to litellm-rust
 
 - Keep the route contract pure in `crates/core/src/<route>/`: define the typed request/response structs and a provider config trait with no network, env, auth, or logging.
-- Add provider identity to `providers/providers.json`: `routing_name` must match Python `LlmProviders.value`; `display_name` is human-facing; `default_api_base` and `api_key_env_var` are optional provider defaults.
+- Add provider identity to `crates/core/src/providers/provider_registry.json`: `routing_name` must match Python `LlmProviders.value`; `display_name` is human-facing; `default_api_base` and `api_key_env_var` are optional provider defaults.
 - Put provider-specific transforms in `crates/providers/src/<provider>/<route>/transformation.rs`, mirroring the Python provider tree and exposing a `const <PROVIDER>_<ROUTE>_CONFIG`.
 - The provider config owns three pure steps: map LiteLLM params, transform the LiteLLM request into the provider request, and transform the provider response back into the LiteLLM response.
 - If the provider has a reverse or normalization step, keep it pure and explicit next to the transforms; do not hide reverse mapping inside the HTTP transport.

litellm-rust/crates/core/build.rs

@@ -119,7 +119,7 @@ fn generate_provider_code(providers: &[ProviderMetadataInput]) -> String {
         .join("\n");
 
     format!(
-        r#"// @generated by crates/core/build.rs from litellm-rust/providers/providers.json.
+        r#"// @generated by crates/core/build.rs from litellm-rust/crates/core/src/providers/provider_registry.json.
 // Do not edit this file by hand.
 
 use std::fmt;
@@ -204,10 +204,10 @@ mod tests {{
     fn registry_provider_values() -> Vec<String> {{
         let raw = include_str!(concat!(
             env!("CARGO_MANIFEST_DIR"),
-            "/../../providers/providers.json"
+            "/src/providers/provider_registry.json"
         ));
         serde_json::from_str::<Vec<RegistryProvider>>(raw)
-            .expect("providers.json parses")
+            .expect("provider_registry.json parses")
             .into_iter()
             .map(|provider| provider.routing_name)
             .collect()
@@ -309,7 +309,7 @@ mod tests {{
 
 fn main() {
     let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
-    let providers_path = manifest_dir.join("../../providers/providers.json");
+    let providers_path = manifest_dir.join("src/providers/provider_registry.json");
     println!("cargo:rerun-if-changed={}", providers_path.display());
     println!(
         "cargo:rerun-if-changed={}",

litellm-rust/crates/core/src/providers/README.md

@@ -1,13 +1,13 @@
 # Rust Provider Registry
 
-`providers.json` is the source of truth for provider identity in `litellm-rust`.
+`provider_registry.json` is the source of truth for provider identity in `litellm-rust`.
 `crates/core/build.rs` reads it at compile time and generates the typed
 `LlmProvider` enum plus static provider metadata. Runtime code does not parse
 this JSON.
 
 To add a provider:
 
-- Add a `providers.json` entry with `routing_name` matching Python
+- Add a `provider_registry.json` entry with `routing_name` matching Python
   `LlmProviders.value` in `litellm/types/utils.py`.
 - Set `display_name` to the human-readable provider name for docs/errors.
 - Set `default_api_base` to a stable provider-level default base URL, or `null`