updated memory calculation and logo

CONTEXT.md

@@ -7,7 +7,7 @@
 >
 > Ask Claude Code: "Please update CONTEXT.md with what we did today"
 
-Last updated: 2026-02-14 (evening)
+Last updated: 2026-02-15
 
 ---
 
@@ -28,7 +28,20 @@ Last updated: 2026-02-14 (evening)
 - **Running on:** demo-felhom (N100 mini PC) at 192.168.0.162:8080
 - **All Phase 1 features working:** deploy, start/stop/restart/update, logs, health-aware states, auth
 
-### What was just completed (2026-02-14)
+### What was just completed (2026-02-15)
+- **Memory validation during deployment**:
+  - Pre-deploy memory check: compares `mem_request` sum against usable system RAM
+  - Hard block if requests exceed usable memory (total - 384MB reserved)
+  - Soft warning if `mem_limit` sum exceeds total RAM (overcommit OK for limits)
+  - `ParseMemoryMB()` supports "500M", "1G", "1.5G", "1024" formats
+  - `CommittedMemory()` sums requests/limits across all deployed stacks
+  - Memory summary bar shown on deploy page before user clicks deploy
+  - `system.reserved_memory_mb` configurable in controller.yaml (default: 384)
+- **Display: `~` prefix on mem_request** in UI badges (display-only, exact value stored)
+- **Felhom.eu logo** replaced text logos in sidebar and login page with actual SVG logo
+  - Logo SVG embedded as Go string constant, served at `/static/felhom-logo.svg`
+
+### Previously completed (2026-02-14)
 - **System info bar on Vezérlőpult dashboard**: RAM, SSD, and optional HDD usage
   - Progress bars with color coding (green < 70%, yellow 70-85%, red > 85%)
   - New `internal/system` package reads `/proc/meminfo` + `syscall.Statfs`
@@ -56,9 +69,9 @@ Last updated: 2026-02-14 (evening)
 1. Deploy a second app (e.g., Immich, Jellyfin) to validate the template system
 2. Test on Raspberry Pi (pi-customer-1)
 3. Add `paths.hdd_path` to demo-felhom controller.yaml to enable HDD bar
-4. Phase 2 continued: CPU/temperature metrics, Healthchecks.io pings
-5. Phase 3: Backup system (DB dumps + restic)
-6. Add memory limits to other app catalog templates (Immich, Jellyfin, etc.)
+4. Add memory limits + `mem_request`/`mem_limit` to other app catalog templates (Immich, Jellyfin, etc.)
+5. Phase 2 continued: CPU/temperature metrics, Healthchecks.io pings
+6. Phase 3: Backup system (DB dumps + restic)
 
 ## Architecture decisions
 
@@ -74,6 +87,9 @@ Last updated: 2026-02-14 (evening)
 | Health-aware state from Docker Status field | Docker's State says "running" even for unhealthy containers |
 | Memory limits via deploy.resources.limits | Prevents runaway containers; ~50% headroom over expected usage |
 | System info from /proc/meminfo + statfs | No external dependencies, cheap to read on each page load |
+| mem_request vs mem_limit (K8s-inspired) | Requests = expected usage (hard block), limits = peak (overcommit OK) |
+| 384MB reserved for system | Prevents deploying apps that would starve the OS/controller |
+| Logo SVG embedded as Go constant | Same approach as CSS/HTML — zero external file deps |
 
 ## Key file locations on demo-felhom