docs(tanstack): update guides for v7

[mhartington]

Needs https://github.com/TanStack/create-tsrouter-app/pull/232 before it can be merged

Summary by CodeRabbit

Documentation

• Updated TanStack Start guide with an interactive CLI setup experience
• Replaced static setup instructions with guided Prisma onboarding prompts
• Simplified example application from complex data models to a basic Todo app
• Enhanced database connection configuration guidance with interactive workflows
• Improved route and component integration patterns in tutorial

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📥 Commits

Reviewing files that changed from the base of the PR and between f3bb75bbd59cbc9994c75d582717ed8ac415c5d2 and e5848d407ebf1139a336ed9c0e6d118be2970f4e.

📒 Files selected for processing (1)

• content/800-guides/160-tanstack-start.mdx (5 hunks)

Walkthrough

This PR updates the TanStack Start guide from a static Posts/Users example to an interactive Todos-focused guide. It replaces scaffolding content with CLI setup prompts, restructures the project layout from app/ to src/, updates the Prisma schema from User/Post models to a simplified Todo model, and adjusts all corresponding imports, routes, loaders, and data-fetching logic.

Changes

Cohort / File(s)	Summary
Interactive Setup & CLI Integration content/800-guides/160-tanstack-start.mdx	Replaces static setup instructions with interactive TanStack Start CLI preview showing project naming, toolchain selection, deployment adapter, and Prisma onboarding prompts. Introduces guided database connection string and configuration flow.
Prisma Schema & Database Configuration content/800-guides/160-tanstack-start.mdx	Updates Prisma schema from User and Post models to a simplified Todo model with id, title, and createdAt fields. Adjusts generator and datasource configuration; replaces dotenv-centric environment setup with CLI-guided approach.
Route Structure & Import Paths content/800-guides/160-tanstack-start.mdx	Restructures project layout from app/ to src/. Updates imports from ../lib/prisma to ../db, changes Route export signature to use App component with loader, and updates route path references to match new file organization.
Data Flow & UI Components content/800-guides/160-tanstack-start.mdx	Modifies loader and server functions to fetch prisma.todo.findMany() instead of posts. Updates UI from "Posts" to "Todos", refactors component data consumption to use Route.useLoaderData() with todos list iteration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

• Verify all import paths (particularly ../db references and src/ structure) remain consistent throughout the guide
• Validate that Prisma schema changes (Todo model definition) align with the data fetching logic in loaders and server functions
• Confirm Route/loader configuration in src/routes/index.tsx examples matches the component's expected data structure
• Ensure all code snippets are syntactically correct and follow TanStack Start patterns

Possibly related PRs

• prisma/docs#7073 — Updates Prisma generator/provider settings and client import path configurations, which intersects with the schema and import changes in this guide.
• prisma/docs#7173 — Modifies the same TanStack Start guide section with server-side route loader wiring, though this PR substantially refactors that area with the Todo model and new import paths.

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: updating TanStack Start documentation to align with v7, including shifts to interactive CLI previews, Prisma schema updates (User/Post to Todo), and new project structure (src/ layout).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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