diff --git a/config/default.toml b/config/default.toml
index 0137de5..84dda02 100644
--- a/config/default.toml
+++ b/config/default.toml
@@ -48,6 +48,33 @@ max_tokens = 2048
 temperature = 0.3
 cache_ttl_seconds = 604800
 rate_limit_patient_daily = 10
+quota_check_enabled = true
+
+[ai.providers.claude]
+provider_type = "claude"
+api_key_env = "ANTHROPIC_API_KEY"
+base_url = "https://api.anthropic.com"
+default_model = "claude-sonnet-4-6"
+max_tokens = 2048
+temperature = 0.3
+is_enabled = true
+
+[ai.providers.openai]
+provider_type = "openai"
+api_key_env = "OPENAI_API_KEY"
+base_url = "https://api.openai.com"
+default_model = "gpt-4o"
+max_tokens = 2048
+temperature = 0.3
+is_enabled = false
+
+[ai.providers.ollama]
+provider_type = "ollama"
+base_url = "http://localhost:11434"
+default_model = "qwen2.5:7b"
+max_tokens = 2048
+temperature = 0.3
+is_enabled = false
 
 [storage]
 upload_dir = "./uploads"
diff --git a/crates/erp-ai/src/config.rs b/crates/erp-ai/src/config.rs
new file mode 100644
index 0000000..c05fcf9
--- /dev/null
+++ b/crates/erp-ai/src/config.rs
@@ -0,0 +1,90 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum ProviderType {
+    Claude,
+    Openai,
+    Ollama,
+    Rules,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ProviderConfig {
+    pub provider_type: ProviderType,
+    pub api_key_env: Option<String>,
+    pub base_url: Option<String>,
+    pub default_model: String,
+    pub max_tokens: u32,
+    pub temperature: f32,
+    #[serde(default = "default_true")]
+    pub is_enabled: bool,
+}
+
+fn default_true() -> bool {
+    true
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct AiModuleConfig {
+    pub default_provider: String,
+    pub cache_ttl_seconds: u64,
+    pub quota_check_enabled: bool,
+    pub rate_limit_patient_daily: u32,
+    pub providers: std::collections::HashMap<String, ProviderConfig>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn provider_type_serde_roundtrip() {
+        let pt = ProviderType::Claude;
+        let json = serde_json::to_string(&pt).unwrap();
+        assert_eq!(json, "\"claude\"");
+        let back: ProviderType = serde_json::from_str(&json).unwrap();
+        assert_eq!(back, pt);
+    }
+
+    #[test]
+    fn provider_type_all_variants() {
+        for pt in [ProviderType::Claude, ProviderType::Openai, ProviderType::Ollama, ProviderType::Rules] {
+            let json = serde_json::to_string(&pt).unwrap();
+            let back: ProviderType = serde_json::from_str(&json).unwrap();
+            assert_eq!(back, pt);
+        }
+    }
+
+    #[test]
+    fn parse_provider_config() {
+        let json = r#"{
+            "provider_type": "openai",
+            "api_key_env": "OPENAI_API_KEY",
+            "base_url": "https://api.openai.com",
+            "default_model": "gpt-4o",
+            "max_tokens": 2048,
+            "temperature": 0.3,
+            "is_enabled": true
+        }"#;
+        let config: ProviderConfig = serde_json::from_str(json).unwrap();
+        assert_eq!(config.provider_type, ProviderType::Openai);
+        assert_eq!(config.default_model, "gpt-4o");
+        assert!(config.is_enabled);
+    }
+
+    #[test]
+    fn parse_ollama_config_no_api_key() {
+        let json = r#"{
+            "provider_type": "ollama",
+            "base_url": "http://localhost:11434",
+            "default_model": "qwen2.5:7b",
+            "max_tokens": 2048,
+            "temperature": 0.3
+        }"#;
+        let config: ProviderConfig = serde_json::from_str(json).unwrap();
+        assert_eq!(config.provider_type, ProviderType::Ollama);
+        assert!(config.api_key_env.is_none());
+        assert!(config.is_enabled); // default
+    }
+}
diff --git a/crates/erp-ai/src/lib.rs b/crates/erp-ai/src/lib.rs
index b6ea311..7d7b9f8 100644
--- a/crates/erp-ai/src/lib.rs
+++ b/crates/erp-ai/src/lib.rs
@@ -1,3 +1,4 @@
+pub mod config;
 pub mod dto;
 pub mod entity;
 pub mod error;
diff --git a/crates/erp-server/src/config.rs b/crates/erp-server/src/config.rs
index c2035fd..c77f0c7 100644
--- a/crates/erp-server/src/config.rs
+++ b/crates/erp-server/src/config.rs
@@ -99,6 +99,26 @@ pub struct AiConfig {
     pub temperature: f32,
     pub cache_ttl_seconds: u64,
     pub rate_limit_patient_daily: u32,
+    #[serde(default)]
+    pub quota_check_enabled: bool,
+    #[serde(default)]
+    pub providers: std::collections::HashMap<String, ProviderConfig>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ProviderConfig {
+    pub provider_type: String,
+    pub api_key_env: Option<String>,
+    pub base_url: Option<String>,
+    pub default_model: String,
+    pub max_tokens: u32,
+    pub temperature: f32,
+    #[serde(default = "default_true")]
+    pub is_enabled: bool,
+}
+
+fn default_true() -> bool {
+    true
 }
 
 #[derive(Debug, Clone, Deserialize)]