Update Module Interaction Diagram

[6543]

followup of #6012

Architecture Diagram Update

Updated the Woodpecker architecture diagram to reflect the current codebase structure.

Changes Made

• Updated package references: server/grpc → server/rpc, server/remote → server/forge
• Added RPC as shared component: Created dedicated "GRPC" box for the rpc/ module used by both agent and server
• Expanded pipeline structure: Now shows pipeline/backend/ and pipeline/frontend/ subcomponents
• Added missing server components: server/cache, server/cron, server/services/
• Listed forge implementations: Shows github, gitlab, gitea, forgejo, bitbucket modules within server/forge/
• Removed obsolete components: shared/oauth2, outdated pipeline/rpc reference

Files

• woodpecker-architecture.dot - Source file in Graphviz DOT format
• woodpecker-architecture.svg - Vector graphic output

Regenerating

To update the diagram after changes:

dot -Tsvg woodpecker-architecture.dot -o woodpecker-architecture.svg

Requires: graphviz package

[woodpecker-bot]

Surge PR preview deployment was removed

[6543]

I know it's not as nice as the old one but it is better to maintain as we can just modify a dot file (text file) and generate an image out of it. this also now focus more on how the components interact as the old one already moved into that direction and we now have package hirarchy described below in tables in more details

[6543]

not sure if we should remove shared libs from the diagram ...?