Add lens pov analysis API

Please pay some attention to the return value of POV. Does that make sense?

@gridinoc does this work for you?

Closes #43 (closed)

api/json-store/lenses.toml

@@ -2,6 +2,8 @@ prompt_template = """You are tasked with evaluating and scoring a project propos
 
 $RUBRIC
 
+$CONSIDERATIONS
+
 Now, carefully read and analyze the following project proposal based on the above rubric:
 
 <proposal>