feat: add delete_conversation and delete_project REST API endpoints

[mike1858]

Summary

Fixes #193 — Delete discussion not working in web mode.

Both delete_conversation and delete_project were available as Tauri commands (desktop mode) but had no corresponding Rocket route handlers in the web server, causing these operations to fail in web mode.

Changes

Single file modified: crates/server/src/main.rs (+33 lines, -1 line)

• Import Rocket's delete macro for HTTP DELETE route support
• Add DELETE /api/conversations/<chat_id> endpoint with URL decoding (matches apiClient.delete() in webApi.ts)
• Add POST /api/delete-project endpoint with DeleteProjectRequest struct (matches apiClient.post() in webApi.ts)
• Register both new routes in the Rocket mount configuration

How It Was Broken

Layer	delete_conversation	delete_project
Frontend UI	✅ ProjectDetail.tsx	✅ Projects.tsx
API Interface	✅ api.ts	✅ api.ts
Web API client	✅ webApi.ts (DELETE)	✅ webApi.ts (POST)
Rocket Server	❌ Missing	❌ Missing
Backend Core	✅ backend/lib.rs	✅ backend/lib.rs
Tauri Command	✅ commands/mod.rs	✅ commands/mod.rs

The frontend, API interface, web API client, and backend logic all existed — only the Rocket HTTP route handlers were missing, breaking the bridge in web mode.

Verification

• cargo build --workspace — ✅ clean
• cargo clippy --package server -- -D warnings — ✅ zero warnings
• Manually tested — ✅ conversation deleted successfully

Summary by CodeRabbit

• New Features
  • Users can now delete individual conversations.
  • Users can now delete projects.

[coderabbitai]

📝 Walkthrough

Walkthrough

Two new API endpoints were added to enable conversation and project deletion via REST API. The DELETE /conversations/<chat_id> endpoint deletes conversations by ID, and the POST /delete-project endpoint removes projects using a project_id from the request body. Route registration was updated in the Rocket framework configuration.

Changes

Cohort / File(s)	Summary
New Delete Endpoints crates/server/src/main.rs	Added two new handler functions: delete_conversation() for removing conversations by chat_id and delete_project() for removing projects. Updated Rocket imports to include delete route qualifier and registered both endpoints in the API route set.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Hop hop, the endpoints are here,
Conversations and projects disappear!
Delete with a bounce, no traces remain,
The API grows strong with each new refrain. 🗑️

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main changes: adding two new REST API endpoints for deleting conversations and projects.
Linked Issues check	✅ Passed	The PR successfully implements the primary objective from issue #193 by adding the DELETE /conversations/<chat_id> endpoint required for discussion deletion in REST API.
Out of Scope Changes check	✅ Passed	The PR includes a delete_project endpoint not mentioned in the linked issue #193, but the scope appears reasonable as a related deletion feature for the same system.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch Fix-Web-Routes

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