feat: Add builder kit focused llms.txt files

[cpcramer]

What changed? Why?
Add builder kit focused llms.txt files for OnchainKit, Smart Wallet, and MiniKit. These are mostly auto generated from https://llmstxt.firecrawl.dev/

• https://docs.base.orgbuilderkits/onchainkit/llms.txt
• https://docs.base.org/builderkits/minikit/llms.txt
• https://docs.base.org/identity/smart-wallet/llms.txt

Notes to reviewers
This is a follow up from chore: Update docs llms.txt file

How has it been tested?
Playground:

• https://web-base-docs-jta0c1utx-coinbase-vercel.vercel.app/builderkits/onchainkit/llms.txt
• https://web-base-docs-jta0c1utx-coinbase-vercel.vercel.app/builderkits/minikit/llms.txt
• https://web-base-docs-jta0c1utx-coinbase-vercel.vercel.app/identity/smart-wallet/llms.txt

Have you tested the following pages?

BaseWeb

• [] base.org
• [] base.org/names
• [] base.org/builders
• [] base.org/ecosystem
• [] base.org/name/jesse
• [] base.org/manage-names
• [] base.org/resources

BaseDocs

• [] docs.base.org
• [] docs sub-pages

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
base-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 7, 2025 7:52pm
web-base-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 7, 2025 7:52pm

[cb-heimdall]

✅ Heimdall Review Status

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