update config, admin-web tooling & relocate agent skills

Update app.json config and add new dependencies in package.json. Update
.gitignore for new patterns. Add timed-exercise editor/list components,
warmup/stretch video migration, and Supabase helpers in admin-web.
Relocate agent skills from .agents/skills/ to .opencode/skills/.

admin-web/migrations/006_warmup_stretch_video.sql

@@ -0,0 +1,71 @@
+-- Migration 006: Warmup, Stretch, and Exercise Video URLs
+-- Extends workout_programs with warmup and stretch blocks
+-- Adds video_url to tabata exercises for background playback during player
+
+-- ─── Add video URLs to tabata exercises ─────────────────────
+
+ALTER TABLE public.program_tabatas
+  ADD COLUMN IF NOT EXISTS exercise_1_video_url TEXT,
+  ADD COLUMN IF NOT EXISTS exercise_2_video_url TEXT;
+
+-- ─── Warmup Exercises ───────────────────────────────────────
+
+CREATE TABLE IF NOT EXISTS public.workout_warmup_exercises (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  program_id UUID NOT NULL REFERENCES public.workout_programs(id) ON DELETE CASCADE,
+  position INTEGER NOT NULL,
+  name TEXT NOT NULL,
+  name_en TEXT,
+  tip TEXT,
+  tip_en TEXT,
+  duration INTEGER NOT NULL,  -- seconds
+  video_url TEXT,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  UNIQUE (program_id, position)
+);
+
+-- ─── Stretch Exercises ──────────────────────────────────────
+
+CREATE TABLE IF NOT EXISTS public.workout_stretch_exercises (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  program_id UUID NOT NULL REFERENCES public.workout_programs(id) ON DELETE CASCADE,
+  position INTEGER NOT NULL,
+  name TEXT NOT NULL,
+  name_en TEXT,
+  tip TEXT,
+  tip_en TEXT,
+  duration INTEGER NOT NULL,  -- seconds
+  video_url TEXT,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  UNIQUE (program_id, position)
+);
+
+-- ─── Indexes ────────────────────────────────────────────────
+
+CREATE INDEX IF NOT EXISTS idx_warmup_program_position
+  ON public.workout_warmup_exercises (program_id, position);
+
+CREATE INDEX IF NOT EXISTS idx_stretch_program_position
+  ON public.workout_stretch_exercises (program_id, position);
+
+-- ─── Row Level Security ─────────────────────────────────────
+
+ALTER TABLE public.workout_warmup_exercises ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.workout_stretch_exercises ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Public read workout_warmup_exercises"
+  ON public.workout_warmup_exercises FOR SELECT USING (true);
+
+CREATE POLICY "Public read workout_stretch_exercises"
+  ON public.workout_stretch_exercises FOR SELECT USING (true);
+
+-- Admin write (service_role bypass RLS, authenticated users controlled elsewhere)
+CREATE POLICY "Admin write workout_warmup_exercises"
+  ON public.workout_warmup_exercises FOR ALL
+  USING (auth.role() = 'service_role')
+  WITH CHECK (auth.role() = 'service_role');
+
+CREATE POLICY "Admin write workout_stretch_exercises"
+  ON public.workout_stretch_exercises FOR ALL
+  USING (auth.role() = 'service_role')
+  WITH CHECK (auth.role() = 'service_role');