refactor: rename plugin pcm to db-editor

[mpicciolli]

What

Renames the plugin directory and identifier from pcm to db-editor, and sets the display name to DB Editor across all three manifests.

Install command becomes:

/plugin install db-editor@pcmstack

Why

pcm named the game rather than the plugin's scope. Two problems with that:

• Trademark. "Pro Cycling Manager" is Cyanide/Nacon's. Using it descriptively ("for Pro Cycling Manager") is fine and stays; using it as the product's own name suggests an affiliation the disclaimer then has to walk back.
• Room to grow. The marketplace pcmstack is the umbrella that carries the game context. If further plugins around the game follow, each needs a name for what it does — so the plugin drops the game name and takes its scope instead.

DB Editor over CDB Editor: the community's tools and vocabulary say "database", not "cdb" — DBEdit, SQL Editor, SQLiteExporter, Excel Editor. The name follows that idiom.

Kept deliberately

• "Pro Cycling Manager" in the manifest descriptions — this is the trigger surface the skills match user requests against, in both English and French. Removing it would break triggering.
• The pcm- prefix on skills (pcm-database, pcm-startlist) — skills from several plugins share an agent's context, so the prefix keeps doing useful work there.

Testing

• All five JSON manifests parse (python3 -m json.tool).
• No residual pcm as a plugin identifier or path anywhere in the repo.
• Renames recorded as renames by git — per-file history is preserved.
• Not exercised against a live install: the plugin is unpublished, and anyone with a local install needs to reinstall under the new id.

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