feat(prompt-optimizer): add prompt optimization APIs and database tables

- Added API endpoints for prompt optimization:
  * POST /prompt/sessions: Create a new prompt optimization session
  * GET /prompt/sessions/{session_id}: Retrieve session message history
  * POST /prompt/sessions/{session_id}/messages: Send message and get optimized prompt
  * PUT /prompt/model: Create or update system prompt model configuration

- Added database models for prompt optimization:
  * prompt_opt_session: Stores session metadata
  * prompt_opt_session_history: Stores session message history
  * prompt_opt_message: Stores user and assistant messages
  * prompt_opt_model_config: Stores system prompt model configurations

- Updated service layer to handle message creation, prompt optimization, and variable parsing
- Added corresponding Pydantic schemas for request and response validation

api/app/schemas/prompt_optimizer_schema.py

@@ -0,0 +1,99 @@
+from pydantic import BaseModel, Field
+from uuid import UUID
+
+
+# =========================================
+# API Request Schemas
+# =========================================
+class PromptOptMessage(BaseModel):
+    model_id: UUID = Field(
+        ...,
+        description="Model ID"
+    )
+    message: str = Field(
+        ...,
+        min_length=1,
+        description="User's input message"
+    )
+
+    current_prompt: str = Field(
+        default="",
+        description="currently optimized prompt"
+    )
+
+
+class PromptOptModelSet(BaseModel):
+    id: UUID | None = Field(
+        default=None,
+        description="Configuration ID"
+    )
+
+    system_prompt: str = Field(
+        ...,
+        description="System Prompt"
+    )
+
+
+# =========================================
+# Service Layer Results
+# =========================================
+class OptimizePromptResult(BaseModel):
+    prompt: str = Field(
+        ...,
+        description="Optimized Prompt"
+    )
+    desc: str = Field(
+        ...,
+        description="Description"
+    )
+
+
+# =========================================
+# API Response Schemas
+# =========================================
+class CreateSessionResponse(BaseModel):
+    model_config = {"from_attributes": True}
+
+    session_id: UUID = Field(
+        ...,
+        description="Session ID"
+    )
+
+
+class OptimizePromptResponse(BaseModel):
+    model_config = {"from_attributes": True}
+
+    prompt: str = Field(
+        ...,
+        description="Optimized Prompt"
+    )
+    desc: str = Field(
+        ...,
+        description="Description"
+    )
+    variables: list = Field(
+        ...,
+        description="Variables"
+    )
+
+
+class SessionMessage(BaseModel):
+    role: str = Field(
+        ...,
+        description="Message role (user/assistant)"
+    )
+    content: str = Field(
+        ...,
+        description="Message content"
+    )
+
+
+class SessionHistoryResponse(BaseModel):
+    session_id: UUID = Field(
+        ...,
+        description="Session ID"
+    )
+    messages: list[SessionMessage] = Field(
+        ...,
+        description="List of messages in the session"
+    )