fix: yaegi plugins cannot import xorm or xormigrate

[tink-bot]

Plugin docs tell plugins to implement Migrations() []*xormigrate.Migration, but neither xorm.io/xorm nor src.techknowlogick.com/xormigrate was registered in yaegi symbol table, so interpreted plugin died at import before loading:

Failed to load yaegi plugin repro-migration: evaluating main.go: 7:2:
import "src.techknowlogick.com/xormigrate" error: unable to find source
related to: "src.techknowlogick.com/xormigrate"...

Cause: yaegiSymbolPackages in magefile.go — list mage generate:yaegi-symbols extracts — omitted both packages. Same shape as #3500 / #3502.

Fixes #3501

Now:

• xormigrate and xorm added to yaegiSymbolPackages; generated xormigrate.go and xorm.go committed.
• pkg/plugins/yaegi/migrations_test.go loads interpreted plugin from testdata/migrationplugin, then runs its MigrateFunc against real sqlite engine and asserts table exists — covers import resolution and interpreted-func-over-*xorm.Engine boundary.

Gotcha for plugin authors

Interpreted types reach xorm as anonymous reflect structs with no methods, so a TableName() method on a plugin struct is invisible and tx.Sync2(new(PluginData)) produces near "(": syntax error (empty table name). Plugin migrations must name the table explicitly: tx.Table("plugin_data").Sync2(&PluginData{}). The docs example on vikunja.io uses the Sync2(new(...)) form and should be updated — docs are not in this repo, so that is not part of this PR.

How to verify

1. Enable the yaegi loader in config.yml (plugins.enabled: true, plugins.loader: yaegi).

2. Drop the repro plugin from yaegi plugins cannot implement migrations: xorm and xormigrate are not exposed in the symbol table #3501 into the plugin directory, changing its migration body to name the table explicitly:

   Migrate: func(tx *xorm.Engine) error {
   	return tx.Table("repro").Sync2(&struct {
   		ID int64 `xorm:"pk autoincr"`
   	}{})
   },

3. Start the API.

4. Expected: the log shows the plugin loading successfully and the migration running; the repro table exists in the database.

5. Before this PR: startup logs Failed to load yaegi plugin ...: unable to find source related to: "src.techknowlogick.com/xormigrate" and the plugin never loads.

[github-actions]

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Last updated for commit ef2c983