Launcher: add Epic Games Store platform

[Kheartz]

Resolve the game through the Epic launcher's plaintext manifests: new External::Epic component, ProjectPlatform::EPIC, and RunInnerEpicChecks mirroring the Steam path.

Summary by CodeRabbit

• New Features

  • Added Epic launcher support for launching games.
  • Detects installed Epic games by reading local Epic .item manifests and uses the discovered install path during launch.
  • Added an optional Epic app name setting to improve matching accuracy.

• Bug Fixes

  • Improved launch validation with a clear error when a matching Epic installation can’t be found.
  • More resilient manifest scanning: ignores missing or unreadable/malformed entries without interrupting discovery.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5b46d473-134c-49eb-924a-0bc450a89e76

📥 Commits

Reviewing files that changed from the base of the PR and between 26de343 and c298dbc.

📒 Files selected for processing (3)

• code/framework/CMakeLists.txt
• code/framework/src/launcher/project.cpp
• code/framework/src/launcher/project.h

Walkthrough

Adds Epic Games Launcher manifest discovery and launcher wiring for an EPIC platform path, including manifest enumeration, app lookup, and pre-launch install-path resolution.

Changes

Epic Launcher Integration

Layer / File(s)	Summary
Epic manifest data contract and header code/framework/src/external/epic/manifest.h	Defines InstalledApp with validation and declares Epic manifest directory, enumeration, and lookup APIs.
Epic manifest discovery implementation code/framework/src/external/epic/manifest.cpp, code/framework/CMakeLists.txt	Implements Epic manifest directory resolution, .item scanning, JSON parsing, app matching, and adds the new source to FrameworkLoader.
Launcher EPIC platform wiring and pre-launch checks code/framework/src/launcher/project.h, code/framework/src/launcher/project.cpp	Adds EPIC to ProjectPlatform, adds epicAppName, declares and implements RunInnerEpicChecks(), and routes Launch() through the Epic validation path.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Poem

I hop through manifests, swift and bright,
Finding Epic games by filename right.
From ProgramData to launch prep glue,
A bunny says: “EPIC now works too!” 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding Epic Games Store platform support to the launcher.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Kheartz]

Woops sorry, didnt mean to close--was cleaning out my branches.