Populate MultiQC methods-description tool citations/bibliography

Description of feature

`methodsDescriptionText()` in `subworkflows/local/utils_nfcore_magmap_pipeline/main.nf` builds the "Methods Description" section rendered into every MultiQC report (called from `workflows/magmap.nf`). However, the two lines that would actually populate it from `toolCitationText()`/`toolBibliographyText()` are commented out:

```groovy
meta["tool_citations"] = ""
meta["tool_bibliography"] = ""

// meta["tool_citations"] = toolCitationText().replaceAll(", \.", ".").replaceAll("\. \.", ".").replaceAll(", \.", ".")
// meta["tool_bibliography"] = toolBibliographyText()
```

So the methods section renders in every report, but always with blank citation/bibliography fields — this predates any specific PR, it's unmodified nf-core template boilerplate that was never activated for magmap. `toolCitationText()`/`toolBibliographyText()` themselves are also still stuck at the nf-core template's default stub (only FastQC/MultiQC), not updated for any of the tools magmap has added since (Prokka, Bakta, Samtools, trimgalore, sourmash, DuckDB, etc.).

To fix properly:

• Fill in `toolCitationText()`/`toolBibliographyText()` with the full current tool list (matching `CITATIONS.md`, which is the actually-maintained/accurate citation list today).
• Uncomment the two `meta["tool_citations"]`/`meta["tool_bibliography"]` lines in `methodsDescriptionText()` to wire them in.

Came up during review of #228 (v1.2.0 release PR) — flagged there as out of scope for that PR since it's pre-existing and affects every tool, not just the one added in that PR.

Compare CITATIONS.md with toolCitationText() and toolBibliographyText() in subworkflows/local/utils_nfcore_magmap_pipeline/main.nf, then inspect methodsDescriptionText() in the same file and its call from workflows/magmap.nf. Update the citation and bibliography content, enable both metadata assignments, and verify that MultiQC Methods Description sections contain the current tool references.