feat: initialize FastAPI project structure with job posting routes and models

src/models/job_listing.py

@@ -0,0 +1,10 @@
+from pydantic import BaseModel, Field
+
+
+class JobListing(BaseModel):
+    title: str = Field(..., description="Job title")
+    company: str = Field(..., description="Company name")
+    location: str = Field(..., description="Location")
+    description: str = Field(..., description="Job description")
+    salary: int | None = Field(None, description="Salary")
+    url: str = Field(..., description="Job URL")