[Element Selector] Support searchPath scoping for image field types

[cancan101]

Adds support for the new "searchPath" class-definition option on the Image, Image Advanced (hotspotimage) and Image Gallery data types (companion to the pimcore/pimcore core change, refs pimcore/pimcore#17157).

When a search path is configured on the field, the asset selector opens with a pre-applied "fullpath" filter seeded from it. The filter is a soft default: it is visible in the selector's Filters sidebar and can be modified or cleared by the user.

• element selector config: new config.assets.searchPath option
• GeneralFiltersDecorator: new initialFilters config, passed as initialValues to the applied-filters store (reset still clears to the unseeded defaults)
• asset selector listing: seeds a fullpath field filter from searchPath
• image / hotspot-image / image-gallery components: thread searchPath from the field definition into every element-selector call site
• class editor: "Search Path" folder picker next to "Upload Path" for all three field definition forms

Claude-Session: https://claude.ai/code/session_01Rf6z83yKPGdQKoVS5B2UeT

Changes in this pull request

Resolves pimcore/pimcore#17157

Additional info

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🚫 Issue-link guardrail failed — this PR has been converted to draft.

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• Resolves https://github.com/pimcore/pimcore/issues/17157 does not reference pimcore/platform-version.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
23.1% Duplication on New Code

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[pimcore-deployments]

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