clean: remove requirements.txt as we're migrating to uv

requirements.txt

@@ -1,26 +0,0 @@
-anyio==4.11.0
-audible==0.8.2
-beautifulsoup4==4.14.2
-certifi==2025.11.12
-h11==0.14.0
-httpcore==0.16.3
-httpx==0.23.3
-idna==3.11
-linkify-it-py==2.0.3
-markdown-it-py==4.0.0
-mdit-py-plugins==0.5.0
-mdurl==0.1.2
-pbkdf2==1.3
-pillow==12.0.0
-platformdirs==4.5.0
-pyaes==1.6.1
-pyasn1==0.6.1
-Pygments==2.19.2
-rfc3986==1.5.0
-rich==14.2.0
-rsa==4.9.1
-sniffio==1.3.1
-soupsieve==2.8
-textual==6.6.0
-typing_extensions==4.15.0
-uc-micro-py==1.0.3