fix(core, react): export of formOptions results in build error

[harry-whorlow]

Exporting formOptions from start results in build error this PR reverts those changes and updated to docs to reflect this.

• revert export of form core
• updated SSR docs
• updated tanstack start example

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View your CI Pipeline Execution ↗ for commit 9c19fd8.

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 40s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	7s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-03-28 17:36:34 UTC

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commit: 9c19fd8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.51%. Comparing base (38f4102) to head (9c19fd8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1351       +/-   ##
===========================================
- Coverage   88.86%   45.51%   -43.35%     
===========================================
  Files          28       13       -15     
  Lines        1275      145     -1130     
  Branches      332       25      -307     
===========================================
- Hits         1133       66     -1067     
+ Misses        127       69       -58     
+ Partials       15       10        -5     

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