fix(server): bound runs pagination parameters

[shunichironomura]

Warning

This content was written by an AI agent and must be verified by a human developer. After human verification, this alert may be removed.

Summary

• normalize HTML and API run-list pagination to limit=1..=1000 and offset=0..=100000
• prevent GET /runs?limit=0 from dividing by zero
• add regression coverage for the HTML route and normalized API response

Fixes #1066.

AI assistance

• AI used: yes — Amp investigated the issue, implemented the fix, and added tests
• Human review of AI-assisted code: pending

Breaking changes

• No breaking changes
• Breaking changes; the breaking change label is applied

Verification

• cargo fmt --check --all
• cargo test -p capsula-server --lib (13 passed)
• RUSTFLAGS='-Dwarnings' cargo clippy -p capsula-server --all-targets --all-features
• cargo test -p capsula-server --test api_tests test_pagination -- --exact --nocapture compiled successfully, but could not execute because this orb has no Docker socket for Testcontainers

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.17%. Comparing base (433b438) to head (82ad267).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1225      +/-   ##
==========================================
+ Coverage   54.16%   55.17%   +1.00%     
==========================================
  Files          44       45       +1     
  Lines        4233     4254      +21     
==========================================
+ Hits         2293     2347      +54     
+ Misses       1940     1907      -33     

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