add deepwiki kind of summariztion for the architecutre graphs

[allenanswerzq]

we already have the arch graph, can invoke llm to explain everything

[allenanswerzq]

https://matklad.github.io/2021/02/06/ARCHITECTURE.md.html

[allenanswerzq]

build apis for a specific file? find all relalted stuff with the a single function? (the first version of the llmcc does stuff like these), but I feel as model becomes stronger and efficient, no need to do all that, our focus should be on given a codemap focus on different level of big scopes