🔨 fix: detect routes defined on APIRouter instances and add tests fo…

[NureddinSoltan]

Fixes #85

Problem

The workspace scanner (findAllFastAPIFiles in appDiscovery.ts) pre-filters files by checking for "FastAPI(" to avoid running tree-sitter on every Python file. This meant router-only files (using APIRouter() without a FastAPI() instance) were silently skipped, which is the standard pattern in larger FastAPI projects.

Fix

Extended the text pre-filter to also match "APIRouter(":

- if (new TextDecoder().decode(content).includes("FastAPI(")) {
+ const text = new TextDecoder().decode(content)
+ if (text.includes("FastAPI(") || text.includes("APIRouter(")) {

The core parsing pipeline already fully supports APIRouter , no other changes needed.

Testing

• Added router-only fixture (standalone APIRouter(), no FastAPI())
• Added test "builds graph from standalone APIRouter-only file" in routerResolver.test.ts
• All 425 tests passing ✅

Before / After

A real FastAPI project - routers were invisible before, fully discovered after.

Before:

After:

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