Added PDF to input modalities for gpt 5.2 codex

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Issue

Issue#9825

Steps

• bun install
• Went into providers/openai/models/gpt-5.2-codex.toml
• Added "pdf" to the modalities input
• cd packages/web
• bun run dev
• cd dist && python3 -m http.server 3000
• In a separate terminal in the opencode dir I ran
  OPENCODE_MODELS_URL=http://localhost:3000 opencode models --refresh OPENCODE_MODELS_URL=http://localhost:3000 opencode
• Opened up a project that contained a PDF and it was able to read it

Screenshot