feat: implement Phase 6 — Software Deployment

Backend:
- SoftwarePackage model (Name, Version, OsType, PackageManager, PackageName, InstallerUrl, Checksum, SilentArgs)
- RmmDbContext: SoftwarePackages DbSet + unique index on (Name, Version, OsType)
- SoftwarePackagesController: full CRUD with OsType filter
- DeployController: POST /api/v1/deploy creates InstallSoftware/UninstallSoftware TaskItem
- EF Migration: AddSoftwarePackages (20260319130448)

Go Agent:
- internal/deployer/deployer.go: Install() and Uninstall() with:
  - Chocolatey (Windows), apt/dnf (Linux), auto-detect
  - Direct installer fallback: HTTP download + SHA256 verify + silent install
  - Supports .msi, .exe (Windows) and .deb, .rpm (Linux)
- main.go: COMMAND_TYPE_INSTALL_SOFTWARE and COMMAND_TYPE_UNINSTALL_SOFTWARE routed to deployer

Frontend:
- SoftwarePage: Katalog tab (CRUD, OS filter, smart package manager select) + Deploy tab
- api/types.ts: SoftwarePackage, PackageManager, DeployRequest/Response types
- api/client.ts: softwarePackagesApi and deployApi
- App.tsx: Software nav item with Package icon

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Frontend/src/api/client.ts

@@ -10,6 +10,10 @@ import type {
   AlertItem,
   CreateAlertRuleRequest,
   UpdateAlertRuleRequest,
+  SoftwarePackage,
+  CreateSoftwarePackageRequest,
+  DeployRequest,
+  DeployResponse,
 } from './types'
 
 const BASE_URL = '/api/v1'
@@ -73,3 +77,23 @@ export const alertsApi = {
   acknowledge: (id: number) =>
     request<{ id: number; acknowledged: boolean }>(`/alerts/${id}/acknowledge`, { method: 'POST' }),
 }
+
+// Software Packages
+export const softwarePackagesApi = {
+  list: (osType?: string) => {
+    const param = osType ? `?osType=${osType}` : ''
+    return request<SoftwarePackage[]>(`/software-packages${param}`)
+  },
+  create: (data: CreateSoftwarePackageRequest) =>
+    request<SoftwarePackage>('/software-packages', { method: 'POST', body: JSON.stringify(data) }),
+  update: (id: number, data: CreateSoftwarePackageRequest) =>
+    request<SoftwarePackage>(`/software-packages/${id}`, { method: 'PUT', body: JSON.stringify(data) }),
+  delete: (id: number) =>
+    request<void>(`/software-packages/${id}`, { method: 'DELETE' }),
+}
+
+// Deploy
+export const deployApi = {
+  deploy: (data: DeployRequest) =>
+    request<DeployResponse>('/deploy', { method: 'POST', body: JSON.stringify(data) }),
+}

Frontend/src/api/types.ts

@@ -132,3 +132,44 @@ export interface UpdateAlertRuleRequest {
   severity?: AlertSeverity
   enabled?: boolean
 }
+
+export type PackageManager = 'choco' | 'apt' | 'dnf' | 'direct'
+
+export interface SoftwarePackage {
+  id: number
+  name: string
+  version: string
+  osType: OsType
+  packageManager: PackageManager
+  packageName: string
+  installerUrl: string | null
+  checksum: string | null
+  silentArgs: string | null
+  createdAt: string
+}
+
+export interface CreateSoftwarePackageRequest {
+  name: string
+  version: string
+  osType: OsType
+  packageManager: PackageManager
+  packageName: string
+  installerUrl?: string
+  checksum?: string
+  silentArgs?: string
+}
+
+export interface DeployRequest {
+  agentId: string
+  packageId: number
+  action: 'install' | 'uninstall'
+}
+
+export interface DeployResponse {
+  id: string
+  agentId: string
+  type: string
+  status: string
+  packageName: string
+  version: string
+}