refactor: ♻️ standerdize filenames and profile names

input/fsh/codeSystems/BDImmunizationSiteCS.fsh

@@ -0,0 +1,18 @@
+CodeSystem: BDImmunizationSiteCS
+Id: bd-immunization-site
+Title: "Bangladesh Immunization Site Code System"
+Description: "Codes for anatomical site of vaccine administration in Bangladesh."
+* ^url = "https://fhir.dghs.gov.bd/core/CodeSystem/bd-immunization-site"
+* ^status = #active
+* ^content = #complete
+
+* #LA "Left Arm"
+    "Vaccine administered in the left arm (intramuscular or subcutaneous)."
+* #RA "Right Arm"
+    "Vaccine administered in the right arm."
+* #LT "Left Thigh"
+    "Vaccine administered in the left thigh."
+* #RT "Right Thigh"
+    "Vaccine administered in the right thigh."
+* #ORAL "Oral"
+    "Vaccine administered orally (e.g., OPV, Rotavirus)."