fix: [build] adapt dconfig in low-version envrionment

[LiHua000]

Log: as title

Bug: https://pms.uniontech.com/bug-view-345745.html

Summary by Sourcery

Ensure DConfig metadata is available in environments without DTK DConfig support by installing the configuration file directly to the expected dsg configs path when DSG_DATA_DIR is not defined.

Enhancements:

• Add a fallback installation path for the DConfig JSON config file when DSG_DATA_DIR is not defined in low-version environments.

Build:

• Update CMake configuration to install the DConfig JSON file into the dsg configs directory when DTK-provided DConfig support is unavailable.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a fallback installation path for the DConfig JSON metadata file when DSG_DATA_DIR is not defined, ensuring builds work in environments without DTK DConfig support.

Flow diagram for DConfig metadata handling in build system

flowchart TD
    A[Configure build] --> B{DSG_DATA_DIR defined?}
    B -- Yes --> C[Use dconfig_meta_files with APPID and configFile]
    C --> D[DTK DConfig handles metadata installation]
    B -- No --> E[Install configFile to CMAKE_INSTALL_DATADIR/dsg/configs/org.deepin.compressor/]
    E --> F[Metadata available via fallback DSG path]

Loading

File-Level Changes

Change	Details	Files
Add non-DTK fallback for installing the DConfig config JSON so builds succeed in low-version environments lacking DSG_DATA_DIR.	Extend the CMake conditional around DConfig handling to include an else branch when DSG_DATA_DIR is not defined. Install the org.deepin.compressor.method.json config file into CMAKE_INSTALL_DATADIR/dsg/configs/org.deepin.compressor/ for the fallback case.	src/CMakeLists.txt

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[sourcery-ai]

Hey - I've left some high level feedback:

• The hardcoded install path dsg/configs/org.deepin.compressor/ may be brittle; consider deriving the last directory component from APPID or a shared variable so APPID changes don’t require manual path updates.
• Before using ${CMAKE_INSTALL_DATADIR} in the new branch, ensure it is always defined in all supported environments (e.g., via include(GNUInstallDirs) in a common place) to avoid configuration-time errors in low-version setups.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The hardcoded install path `dsg/configs/org.deepin.compressor/` may be brittle; consider deriving the last directory component from `APPID` or a shared variable so APPID changes don’t require manual path updates.
- Before using `${CMAKE_INSTALL_DATADIR}` in the new branch, ensure it is always defined in all supported environments (e.g., via `include(GNUInstallDirs)` in a common place) to avoid configuration-time errors in low-version setups.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: LiHua000, max-lvs

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[LiHua000]

/merge