refactor(rename): handler functions, routes, legacy 301 redirects
Second rename pass closing the backend cleanup:
* handler functions (handleListProjekte, handleCreateFrist, …) renamed
to English equivalents so every symbol in the handler package matches
the URL/entity it serves.
* services.FristStatusFilter + filter constants renamed to
DeadlineStatusFilter / DeadlineFilterOverdue etc.
* services.TerminListFilter / TerminCalDAVPusher / TerminSummaryCounts
renamed to AppointmentListFilter / AppointmentCalDAVPusher /
AppointmentSummaryCounts.
* GlossarTerm/GlossarSuggestion/glossarTerms → Glossary*.
* CourtsFeedback/CourtsResponse (formerly Gerichte*).
* handlers.Services.{Projekt,Parteien,Frist,Termin,Notiz,Dezernat} →
{Project,Party,Deadline,Appointment,Note,Department}; dbServices
struct + consumers likewise.
* email templates: {{.FristURL}} → {{.DeadlineURL}}, {{.FristenURL}} →
{{.DeadlinesURL}}.
* links.go category IDs: gerichte → courts.
* cmd/server/main.go local vars: projektSvc/terminSvc/dezernatSvc →
projectSvc/appointmentSvc/departmentSvc.
Routes:
* removed all /api/akten alias routes (API clients use /api/projects now).
* removed /api/akten/*/deadlines, /*/notes, /*/parties, /*/appointments,
/*/checklists, /*/events, /*/summary alias variants.
* new internal/handlers/redirects.go registers 301 Moved Permanently
redirects for every legacy German GET path: /akten, /projekte, /fristen,
/termine, /notizen, /einstellungen, /checklisten, /dezernate, /parteien,
/gerichte, /glossar. Sub-paths + query strings are preserved so old
bookmarks keep working.
Kept in German (product names, per task spec):
* /tools/fristenrechner, /tools/kostenrechner, /tools/gebuehrentabellen
* FristenrechnerService / KostenrechnerService types
* User.Dezernat + paliad.users.dezernat free-text legacy column (separate
from the new paliad.departments entity).
go build / vet / test clean.
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