Refactor component terminology to programs in config and manifest

- Updated the terminology from "components" to "programs" across the codebase, including in config loading, saving, and manifest specifications.
- Introduced a new `stacks.py` file to handle lifecycle actions for development stacks, implementing handlers for Python and React Vite stacks.
- Adjusted tests to reflect the new program structure and ensure proper functionality.
- Revised documentation to align with the new terminology and structure, ensuring clarity on the purpose and configuration of programs, services, and jobs.

app/src/components/ScheduledSection.tsx

@@ -1,12 +1,12 @@
 import { Link } from "react-router-dom"
 import { Play, RefreshCw, Square } from "lucide-react"
-import type { ComponentSummary, HealthStatus } from "@/types"
+import type { JobSummary, HealthStatus } from "@/types"
 import { useServiceAction } from "@/services/api/hooks"
 import { SectionHeader } from "./SectionHeader"
 import { StackBadge } from "./StackBadge"
 
 interface ScheduledSectionProps {
-  jobs: ComponentSummary[]
+  jobs: JobSummary[]
   statuses: HealthStatus[]
 }
 
@@ -38,7 +38,7 @@ export function ScheduledSection({ jobs, statuses }: ScheduledSectionProps) {
   )
 }
 
-function ScheduledRow({ job, health }: { job: ComponentSummary; health?: HealthStatus }) {
+function ScheduledRow({ job, health }: { job: JobSummary; health?: HealthStatus }) {
   const { mutate, isPending } = useServiceAction()
   const isDown = health?.status === "down"