docs(site): document all schedule expression types in schedule-syntax guide

[github-actions]

Summary

• Expands the schedule-syntax guide to cover all supported schedule forms, which were previously undocumented on the site: hourly, bi-weekly, tri-weekly, every N days/weeks, minute intervals, bare daily/weekly forms, and 12-hour time format.
• Adds an important accuracy note that minute intervals are fixed, not scattered — unlike all other schedule types.
• Documents the valid hour intervals (1, 2, 3, 4, 6, 8, 12 — factors of 24) to help users avoid the compile-time warning.
• Adds practical example for frequent monitoring with minute intervals.
• Improves the Tips section to guide users toward the right schedule type for their use case.

Changes

• site/src/content/docs/guides/schedule-syntax.mdx: reorganized into complete sections covering all schedule variants; added Minute intervals section; added Multi-day and bi-weekly section; added 12-hour time format note; updated scattering section to note the fixed-interval exception; improved tips.

Accuracy checks

• hourly: confirmed in src/fuzzy_schedule.rs module doc comment and FuzzySchedule::Hourly variant.
• bi-weekly / tri-weekly: confirmed via FuzzySchedule::BiWeekly/TriWeekly and parser at lines 279–287.
• every N days / every N weeks: confirmed via FuzzySchedule::EveryDays and create_interval_schedule at line 492/498.
• Minute intervals fixed (not scattered): confirmed via FuzzySchedule::EveryMinutes doc comment "fixed, not scattered".
• Valid hour intervals (1,2,3,4,6,8,12): confirmed by warning message in create_interval_schedule at line 471.
• Minimum 5-minute interval: confirmed at line 486.
• 12-hour time format (3pm, 11am, midnight, noon): confirmed in parse_time_spec at lines 150–192.

Validation

• cd site && npm ci && npm run build — 29 pages built, all internal links valid.

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