fix(docker): place MIB parser in /usr/local/bin to survive COPY backend/

The tod-mib-parser at /app/ was overwritten by COPY backend/ .
Move to /usr/local/bin/ and update config path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/config.py

@@ -140,7 +140,7 @@ class Settings(BaseSettings):
     LICENSE_DEVICES: int = 250
 
     # MIB parser binary path (tod-mib-parser Go binary)
-    MIB_PARSER_PATH: str = "/app/tod-mib-parser"
+    MIB_PARSER_PATH: str = "/usr/local/bin/tod-mib-parser"
 
     # App settings
     APP_NAME: str = "TOD - The Other Dude"

infrastructure/docker/Dockerfile.api

@@ -50,15 +50,12 @@ WORKDIR /app
 # Copy installed packages from builder
 COPY --from=builder /install /usr/local
 
-# Copy MIB parser binary from Go builder stage
-COPY --from=mib-builder /tod-mib-parser /app/tod-mib-parser
-
-# Copy pre-loaded MIB files for common vendor support
-COPY backend/mibs/ /app/mibs/
-
 # Copy application source
 COPY backend/ .
 
+# Copy MIB parser binary from Go builder stage (after COPY backend/ so it's not overwritten)
+COPY --from=mib-builder /tod-mib-parser /usr/local/bin/tod-mib-parser
+
 # Change ownership to non-root user
 RUN chown -R appuser:appuser /app