feat: add LLM provider and model data models

Introduced two new data models for managing Language Learning Models (LLMs):
- LLMProvider: Represents LLM providers like OpenAI, Anthropic
- LLMModel: Represents specific models within a provider

Models include key attributes such as:
- Naming and display information
- Enabled/priority status
- Supported features
- Token pricing
- Configuration schemas

core/models/models/llm_model.go

@@ -0,0 +1,41 @@
+package models
+
+import (
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+// LLMModel represents a specific model within an LLM provider
+type LLMModel struct {
+	BaseModel[LLMModel] `bson:",inline"`
+	ProviderId          primitive.ObjectID     `json:"provider_id" bson:"provider_id"`                         // Reference to the provider
+	ModelId             string                 `json:"model_id" bson:"model_id"`                               // Provider's model ID
+	Name                string                 `json:"name" bson:"name"`                                       // Model name
+	DisplayName         string                 `json:"display_name" bson:"display_name"`                       // Display name for UI
+	Description         string                 `json:"description,omitempty" bson:"description,omitempty"`     // Description of the model
+	IsEnabled           bool                   `json:"is_enabled" bson:"is_enabled"`                           // Whether this model is enabled
+	Priority            int                    `json:"priority" bson:"priority"`                               // Priority for sorting in UI
+	ModelFamily         string                 `json:"model_family,omitempty" bson:"model_family,omitempty"`   // Family this model belongs to (e.g., "gpt-4", "claude")
+	ContextSize         int                    `json:"context_size" bson:"context_size"`                       // Context window size in tokens
+	MaxOutputTokens     int                    `json:"max_output_tokens" bson:"max_output_tokens"`             // Maximum output tokens
+	SupportedFeatures   []string               `json:"supported_features" bson:"supported_features"`           // Features supported by this model
+	DefaultParameters   map[string]interface{} `json:"default_parameters" bson:"default_parameters"`           // Default parameters for this model
+	TokenPricing        *TokenPricing          `json:"token_pricing,omitempty" bson:"token_pricing,omitempty"` // Pricing information
+}
+
+// TokenPricing represents the pricing structure for tokens used by an LLM model
+type TokenPricing struct {
+	InputTokenPrice  float64 `json:"input_token_price" bson:"input_token_price"`   // Price per input token (USD per 1M tokens)
+	OutputTokenPrice float64 `json:"output_token_price" bson:"output_token_price"` // Price per output token (USD per 1M tokens)
+	Currency         string  `json:"currency" bson:"currency"`                     // Currency for pricing, default is USD
+}
+
+// GetModelColName returns the collection name for the model
+func (m *LLMModel) GetModelColName() string {
+	return "llm_models"
+}
+
+// Validate validates the model
+func (m *LLMModel) Validate() error {
+	// Basic validation can be implemented here
+	return nil
+}

core/models/models/llm_provider.go

@@ -0,0 +1,25 @@
+package models
+
+// LLMProvider represents a language model provider such as OpenAI, Anthropic, etc.
+type LLMProvider struct {
+	BaseModel[LLMProvider] `bson:",inline"`
+	Name                   string   `json:"name" bson:"name"`                                   // Provider name (e.g., "openai", "anthropic", "gemini")
+	DisplayName            string   `json:"display_name" bson:"display_name"`                   // Display name for UI
+	Description            string   `json:"description,omitempty" bson:"description,omitempty"` // Description of the provider
+	IsEnabled              bool     `json:"is_enabled" bson:"is_enabled"`                       // Whether this provider is enabled
+	Priority               int      `json:"priority" bson:"priority"`                           // Priority for sorting in UI
+	ConfigSchema           string   `json:"config_schema" bson:"config_schema"`                 // JSON schema for configuration
+	DefaultConfig          string   `json:"default_config" bson:"default_config"`               // Default configuration as JSON
+	SupportedFeatures      []string `json:"supported_features" bson:"supported_features"`       // Features supported by this provider (e.g., "function_calling", "streaming")
+}
+
+// GetModelColName returns the collection name for the provider model
+func (p *LLMProvider) GetModelColName() string {
+	return "llm_providers"
+}
+
+// Validate validates the provider model
+func (p *LLMProvider) Validate() error {
+	// Basic validation can be implemented here
+	return nil
+}