fix(core): move cmd/xportal to xcmd/xportal

[pcfreak30]

• sumdb has phantom module entries for cmd/ and cmd/xportal paths
• renaming to xcmd/xportal avoids poisoned sumdb resolution
• new install path: go.lumeweb.com/xportal/xcmd/xportal@latest

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Move the command directory from cmd/xportal to xcmd/xportal, updating the install path in the README accordingly. This renames the main command entry point to align with the xcmd naming convention.

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