feat: Introduce three-tier expedition reward system

[Geda173]

Description

This PR introduces the three-tier expedition reward system. Expedition finds (resources, ships, dark matter) now have three tiers of outcome, matching the original OGame behaviour:

• Normal (89%): base reward, 1× multiplier
• Rare (10%): 2–3× multiplier
• Exceptional (1%): 5–10× multiplier

The same 89/10/1 weighting was already present for combat (NPC battle size) and delay factors, but each used its own copy of the algorithm. These have been unified under a new AppUtil::selectWeightedRandom() helper.

Expedition messages are now classified by tier: normal-find messages are selected for normal outcomes, and more dramatic messages for rare/exceptional outcomes. A number of new messages have been added to fill out the rare and exceptional tiers.

Type of Change:

• Bug fix
• Feature enhancement
• Documentation update
• Other (please describe):

Related Issues

Fixes #957

Checklist

Before submitting this pull request, ensure all following requirements as outlined in CONTRIBUTING.md are met:

• Automated Refactoring: Rector has been run and no outstanding issues remain.
• Code Standards: Code adheres to PSR-12 coding standards. Verified with Laravel Pint.
• Static Analysis: Code passes PHPStan static code analysis.
• Testing:
  • Relevant unit and feature tests are included or updated.
  • Tests successfully run locally.
• CSS & JS Build: CSS and JS assets are compiled using Laravel Mix if any changes are made to JS/CSS files.
• Documentation: Documentation has been updated to reflect any changes made.

Additional Information

Not all tier slots have final messages yet. The rare and exceptional tiers for resources, ships, and dark matter currently use placeholder or partially sourced text. Authentic OGame messages for those tiers still need to be researched and added to resources/lang/en/t_messages.php (and translated). The $numberOfVariations, $normalVariations, $rareVariations, and $exceptionalVariations counts on each message class will need to be updated accordingly.

[github-actions]

Preview deployment

Preview environment for this PR is ready for functional testing. Use one of the test accounts below to log in.

Status	URL	Commit	Last deployed
✅ Live	https://pr-1399.preview.ogamex.dev	9999c2e	2026-07-24 12:26:40 UTC

Test accounts (click to expand)

Email (login)	Password	Role	Class	Planets	Description
test1@ogamex.dev	test	admin	Collector	2	Admin, high resources, mining focus
test2@ogamex.dev	test	player	General	1	Military focus, ships & fleet
test3@ogamex.dev	test	player	Discoverer	1	Exploration, probes & cargo ships
test4@ogamex.dev	test	player	None	1	New player, no class selected yet
test5@ogamex.dev	test	moderator	Collector	1	Moderator, balanced setup
test6@ogamex.dev	test	player	General	1	Vacation mode enabled
test7@ogamex.dev	test	player	General	3	Heavy defense across planets
test8@ogamex.dev	test	player	Discoverer	1	Fleet focus, inactive (i) 8 days
test9@ogamex.dev	test	player	Collector	1	Beginner, long inactive (I) 40 days
test10@ogamex.dev	test	player	General	5	Endgame, 90 unread messages

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