fix: dashboard endpoint and SSH key Fernet key generation

- Create missing /dashboard/summary endpoint that frontend expects
- Fix SSH key Fernet key generation to use proper base64 encoding
  (was using raw session secret slice which failed validation)

apps/api/src/api/dashboard.py

@@ -0,0 +1,52 @@
+import uuid
+
+from fastapi import APIRouter, Depends
+from sqlalchemy import func, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.auth.dependencies import get_current_user_id, get_db_session
+from src.models.git_repository import GitRepository
+from src.models.project import Project
+from src.models.ssh_key import SSHKey
+
+router = APIRouter(prefix="/dashboard", tags=["dashboard"])
+
+
+@router.get("/summary")
+async def get_dashboard_summary(
+    user_id: uuid.UUID = Depends(get_current_user_id),
+    session: AsyncSession = Depends(get_db_session),
+) -> dict:
+    # Count user's projects
+    projects_result = await session.execute(
+        select(func.count()).select_from(Project).where(Project.owner_id == user_id)
+    )
+    projects_count = projects_result.scalar() or 0
+
+    # Count user's repositories
+    repos_result = await session.execute(
+        select(func.count()).select_from(GitRepository).where(GitRepository.owner_id == user_id)
+    )
+    repos_count = repos_result.scalar() or 0
+
+    # Count user's SSH keys
+    ssh_keys_result = await session.execute(
+        select(func.count()).select_from(SSHKey).where(SSHKey.user_id == user_id)
+    )
+    ssh_keys_count = ssh_keys_result.scalar() or 0
+
+    # Get recent activity (latest 5 projects)
+    recent_projects = await session.execute(
+        select(Project)
+        .where(Project.owner_id == user_id)
+        .order_by(Project.created_at.desc())
+        .limit(5)
+    )
+    recent_activity = [f"Created project: {p.name}" for p in recent_projects.scalars().all()]
+
+    return {
+        "projects": projects_count,
+        "repositories": repos_count,
+        "sshKeys": ssh_keys_count,
+        "recentActivity": recent_activity,
+    }

apps/api/src/api/ssh_keys.py

@@ -25,9 +25,16 @@ async def _get_user(session: AsyncSession, user_id: uuid.UUID) -> User:
 
 
 def _get_fernet() -> Fernet:
+    """Generate a valid Fernet key from the session secret."""
+    import base64
+    import hashlib
+    
     settings = Settings()
-    key = settings.session_secret[:32].ljust(32, "=")
-    return Fernet(key.encode())
+    # Derive a 32-byte key from the session secret using SHA256
+    key_bytes = hashlib.sha256(settings.session_secret.encode()).digest()
+    # Base64 encode it for Fernet (must be 32 url-safe base64-encoded bytes)
+    key = base64.urlsafe_b64encode(key_bytes)
+    return Fernet(key)
 
 
 def generate_ssh_key_pair() -> tuple[str, str]:

apps/api/src/main.py

@@ -7,6 +7,7 @@ from fastapi.staticfiles import StaticFiles
 from sqlalchemy import select, text
 
 from src.api.auth import router as auth_router
+from src.api.dashboard import router as dashboard_router
 from src.api.git_repositories import router as git_repositories_router
 from src.api.projects import router as projects_router
 from src.api.ssh_keys import router as ssh_keys_router
@@ -156,6 +157,7 @@ async def health_check():
         return {"status": "unhealthy", "database": "disconnected", "error": str(exc)}
 
 app.include_router(auth_router)
+app.include_router(dashboard_router)
 app.include_router(projects_router)
 app.include_router(users_router)
 app.include_router(ssh_keys_router)